24740 + Interview Questions in Mathematics Page 153 InterviewSolution

7601.	The bisects of exterior angle at B and C of ΔABC meet at O. If ∠A = x°, then ∠BOC =(a) 90°+x°2(b) 90°-x°2(c) 180°+x°2(d) 180°-x°2
Answer» The bisects of exterior angle at B and C of ΔABC meet at O. If ∠A = x°, then ∠BOC = (a) $90 ° + \frac{x °}{2}$ (b) $90 ° - \frac{x °}{2}$ (c) $180 ° + \frac{x °}{2}$ (d) $180 ° - \frac{x °}{2}$

Discussion

7602.	What is the collective term for aces, jacks, queens and kings in cards? __
Answer» What is the collective term for aces, jacks, queens and kings in cards? __

Discussion

7603.	88.A sector of a circle of radius R metres is bounded by an Arc A and by two radii OA and OB at an angle beeta radian given that the perimeter of the sector is 18m and that the area of a sector is 8 m square calculate the numerical values of R and beeta
Answer» 88.A sector of a circle of radius R metres is bounded by an Arc A and by two radii OA and OB at an angle beeta radian given that the perimeter of the sector is 18m and that the area of a sector is 8 m square calculate the numerical values of R and beeta

Discussion

7604.	Prove the theorem of intersecting chords.
Answer» Prove the theorem of intersecting chords.

Discussion

7605.	State whether the following statements are true or false. Justify your answers.(i) Every irrational number is a real number.(ii) Every point on the number line is of the form √m, where ′m′ is a natural number.(iii) Every real number is an irrational number.
Answer» State whether the following statements are true or false. Justify your answers. (i) Every irrational number is a real number. (ii) Every point on the number line is of the form $\sqrt{m},$ where $^{'} m^{'}$ is a natural number. (iii) Every real number is an irrational number.

7605.

State whether the following statements are true or false. Justify your answers.(i) Every irrational number is a real number.(ii) Every point on the number line is of the form √m, where ′m′ is a natural number.(iii) Every real number is an irrational number.

Answer»

State whether the following statements are true or false. Justify your answers.

(i) Every irrational number is a real number.

(ii) Every point on the number line is of the form $\sqrt{m},$ where $^{'} m^{'}$ is a natural number.

(iii) Every real number is an irrational number.

Discussion

7606.	Circumference of the base of a cylinder open at the top is 132cm. The sum of the radius and slant height of the cylinder is 41cm. Find the cost of polishing the outer surface of cylinder at the rate of ₹400 per m2.
Answer» Circumference of the base of a cylinder open at the top is 132cm. The sum of the radius and slant height of the cylinder is 41cm. Find the cost of polishing the outer surface of cylinder at the rate of ₹400 per m^2.

Discussion

7607.	The number of dimensions of a surface are(a) 1(b) 2(c) 3(d) 0
Answer» The number of dimensions of a surface are (a) 1 (b) 2 (c) 3 (d) 0

Discussion

7608.	Question 13Write an equation of a line passing through the point representing solution of the pair of linear equations x + y = 2 and 2x – y = 1, how many such lines can we find?
Answer» Question 13 Write an equation of a line passing through the point representing solution of the pair of linear equations x + y = 2 and 2x – y = 1, how many such lines can we find?

Discussion

7609.	Question 12Is it possible to construct a triangle with lengths of its sides as 8 cm, 7 cm and 4 cm? Give reason for your answer.
Answer» Question 12 Is it possible to construct a triangle with lengths of its sides as 8 cm, 7 cm and 4 cm? Give reason for your answer.

Discussion

7610.	Question 4In the figure, BD and CE intersect each other at the point P. Is ΔPBC∼ΔPDE? Why?
Answer» Question 4 In the figure, BD and CE intersect each other at the point P. Is $Δ P B C \sim Δ P D E$ ? Why?

Discussion

7611.	Question 1 (v)Classify 2π as rational or irrational.
Answer» Question 1 (v) Classify $2 π$ as rational or irrational.

Discussion

7612.	Draw a triangle with two sides of 5 cm and 6 cm and the angle between them is 45∘. Also, find the circumradius of the triangle measures.
Answer» Draw a triangle with two sides of 5 cm and 6 cm and the angle between them is 45 $^{\circ}$ . Also, find the circumradius of the triangle measures.

Discussion

7613.	Question 73Fill in the blanks to make the statements true.If all sides of a quadrilateral are equal, it is a .
Answer» Question 73 Fill in the blanks to make the statements true. If all sides of a quadrilateral are equal, it is a .

Discussion

7614.	Question 8In the figure, l∥m and M is the mid-point of a line segment AB. Show that M is also the mid-point of any line segment CD, having its end points of l and m, respectively.
Answer» Question 8 In the figure, $l ∥ m$ and M is the mid-point of a line segment AB. Show that M is also the mid-point of any line segment CD, having its end points of l and m, respectively.

Discussion

7615.	Locate the position of the ball lying on the given number line.
Answer» Locate the position of the ball lying on the given number line.

Discussion

7616.	There is a slide in a park. One of its side walls has been painted in some colour with a message “KEEP THE PARK GREEN AND CLEAN”. If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour.
Answer» There is a slide in a park. One of its side walls has been painted in some colour with a message “KEEP THE PARK GREEN AND CLEAN”. If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour.

Discussion

7617.	In the given figure, seg AB≅ seg CB and seg AD≅ seg CD. Prove that △ABD≅△CBD.
Answer» In the given figure, $seg A B ≅ seg C B and seg A D ≅ seg C D .$ Prove that $△ A B D ≅ △ C B D$ .

Discussion

7618.	In the given figure, line AB \|\| line CD and line PQ is transversal. Measure of one of the angles is given. Hence find the measures of the following angles. (i) ∠ART(ii) ∠CTQ(iii) ∠DTQ(iv) ∠PRB
Answer» In the given figure, line AB \|\| line CD and line PQ is transversal. Measure of one of the angles is given. Hence find the measures of the following angles. (i) ∠ART (ii) ∠CTQ (iii) ∠DTQ (iv) ∠PRB

Discussion

7619.	In the given figure PQ \|\| BC, ∠4 = ∠5 and QB bisects ∠PQC. Find ∠1. 60
Answer» In the given figure PQ \|\| BC, $∠ 4 = ∠ 5$ and QB bisects $∠ P Q C$ . Find $∠ 1$ . 60

Discussion

7620.	Question 10Rationalize the denominator of the following(i)23√3(ii)√40√3(iii)3+√24√2(iv)16√41−5(v)2+√32−√3(vi)√6√2+√3(vii)√3+√2√3−√2(viii)3√5+√3√5−√3(ix)4√3+5√2√48+√18Thinking processFor rationalizing the denominator multiplying numerator by the conjugate of the denominator term and simplify it to get the result.
Answer» Question 10 Rationalize the denominator of the following $(i) \frac{2}{3 \sqrt{3}} (i i) \frac{\sqrt{40}}{\sqrt{3}} (i i i) \frac{3 + \sqrt{2}}{4 \sqrt{2}} (i v) \frac{16}{\sqrt{41 - 5}} (v) \frac{2 + \sqrt{3}}{2 - \sqrt{3}} (v i) \frac{\sqrt{6}}{\sqrt{2} + \sqrt{3}} (v i i) \frac{\sqrt{3} + \sqrt{2}}{\sqrt{3} - \sqrt{2}}$ $(v i i i) \frac{3 \sqrt{5} + \sqrt{3}}{\sqrt{5} - \sqrt{3}}$ $(i x) \frac{4 \sqrt{3} + 5 \sqrt{2}}{\sqrt{48} + \sqrt{18}}$ Thinking process For rationalizing the denominator multiplying numerator by the conjugate of the denominator term and simplify it to get the result.

Discussion

7621.

The population of Delhi State in different census years is as given below: Census year 1961 1971 1981 1991 2001 Population in Lakhs 30 55 70 110 150

Answer»

The population of Delhi State in different census years is as given below:

Census year	1961	1971	1981	1991	2001
Population in Lakhs	30	55	70	110	150

Discussion

7622.	The two lines represented by the equations: 6x - 3y + 10 = 0 and 2x - y + 9 = 0, are _______.
Answer» The two lines represented by the equations: 6x - 3y + 10 = 0 and 2x - y + 9 = 0, are _______.

Discussion

7623.	What are the derivations for the formula of mode and median in statistics?
Answer» What are the derivations for the formula of mode and median in statistics?

Discussion

7624.	Question 20 The mean of 25 observation is 36. Out of these observations, if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is: A) 23 B) 36 C) 38 D) 40
Answer» Question 20 The mean of 25 observation is 36. Out of these observations, if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the $13^{t h}$ observation is: A) 23 B) 36 C) 38 D) 40

Discussion

7625.	The hypotenuse of a right angled triangle is 3.5 metres long and another of its sides is 2.5 metres long.Calculate its perimeter correct to centimetres.
Answer» The hypotenuse of a right angled triangle is 3.5 metres long and another of its sides is 2.5 metres long. Calculate its perimeter correct to centimetres.

7625.

The hypotenuse of a right angled triangle is 3.5 metres long and another of its sides is 2.5 metres long.Calculate its perimeter correct to centimetres.

Answer»

The hypotenuse of a right angled triangle is 3.5 metres long and another of its sides is 2.5 metres long.

Calculate its perimeter correct to centimetres.

Discussion

7626.	Prove the following identities (1-16)1+cot x+tan x sin x-cos xsec3 x-cosec3 x=sin2 x cos2 x
Answer» Prove the following identities (1-16) $\frac{(1 + \cot x + \tan x) (\sin x - \cos x)}{\sec^{3} x - {cosec}^{3} x} = \sin^{2} x \cos^{2} x$

Discussion

7627.	If the point C(− 2, 3) is equidistant from the points A(3, − 1) and B(x, 8), find the value of x. Also, find the distance BC.
Answer» If the point C(− 2, 3) is equidistant from the points A(3, − 1) and B(x, 8), find the value of x. Also, find the distance BC.

Discussion

7628.	Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see the given figure). Prove that ∠ACP = ∠QCD.
Answer» Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see the given figure). Prove that ∠ACP = ∠QCD.

7628.

Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see the given figure). Prove that ∠ACP = ∠QCD.

Answer»

Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see the given figure). Prove that ∠ACP = ∠QCD.

Discussion

7629.	The chord of a circle is equal to its radius. The angle subtended by this chord at the minor arc of the circle is(a) 60°(b) 75°(c) 120°(d) 150°
Answer» The chord of a circle is equal to its radius. The angle subtended by this chord at the minor arc of the circle is (a) 60° (b) 75° (c) 120° (d) 150°

Discussion

7630.	Factorise:40 + 3x – x2
Answer» Factorise: 40 + 3x – x²

Discussion

7631.	Question 6 In the figure, ΔABC has sides AB = 7.5 cm, AC = 6.5 cm and BC = 7cm. On base BC a parallelogram DBCE of same area as that of ΔABC is constructed. Find the height DF of the parallelogram.
Answer» Question 6 In the figure, $Δ A B C$ has sides AB = 7.5 cm, AC = 6.5 cm and BC = 7cm. On base BC a parallelogram DBCE of same area as that of $Δ A B C$ is constructed. Find the height DF of the parallelogram.

Discussion

7632.	Two circles of radii 5 cm and 3 cm intersect at two points and the distance betweentheir centres is 4cm. Find the length of the common chord
Answer» Two circles of radii 5 cm and 3 cm intersect at two points and the distance betweentheir centres is 4cm. Find the length of the common chord

Discussion

7633.	Choose the correct statements.
Answer» Choose the correct statements.

Discussion

7634.	If a particular number system having base B, such that(√21)B=(3)10Then the value of B is _____4
Answer» If a particular number system having base B, such that $(\sqrt{21})_{B} = (3)_{10}$ Then the value of $B$ is _____ 4

Discussion

7635.	A cylindrical pillar is 50cm in diameter and 3.5m in height. Find the coat of painting the curved surface of the pillar at the rate of ₹12.50 per m×m.
Answer» A cylindrical pillar is 50cm in diameter and 3.5m in height. Find the coat of painting the curved surface of the pillar at the rate of ₹12.50 per m×m.

Discussion

7636.	Classify the following numbers as rational or irrational (i) √23 (ii) √225(iii) 0.3796
Answer» Classify the following numbers as rational or irrational (i) $\sqrt{23}$ (ii) $\sqrt{225}$ (iii) 0.3796

Discussion

7637.	Question 185In the following figure, AB∥DC and AD=BC. Find the value of x.
Answer» Question 185 In the following figure, $A B ∥ D C$ and $A D = B C$ . Find the value of x.

Discussion

7638.	A triangle and a parallelogram are on the same base and between the same parallels. The ratio of the areas of triangle and parallelogram is(a) 1 : 1(b) 1 : 2(c) 2 : 1(d) 1 : 3
Answer» A triangle and a parallelogram are on the same base and between the same parallels. The ratio of the areas of triangle and parallelogram is (a) 1 : 1 (b) 1 : 2 (c) 2 : 1 (d) 1 : 3

Discussion

7639.	If ABCD (in order) is a quadrilateral inscribed in a circle, then which of the following is/are always true?
Answer» If $A B C D$ (in order) is a quadrilateral inscribed in a circle, then which of the following is/are always true?

Discussion

7640.	Marks obtained by 5 students in a class test out of 25 are 12, 15, 12, 20 and 17 respectively. Find the mode of the given number of observations.
Answer» Marks obtained by 5 students in a class test out of 25 are 12, 15, 12, 20 and 17 respectively. Find the mode of the given number of observations.

Discussion

7641.	ABCD is a quadrilateral in which P, Q, R and S are mid-points of the sides AB, BC, CD and DA. AC is the diagonal. Show that(i) SR \|\| AC and SR=12AC(ii) PQ = SR(iii) PQRS is a parallelogram.
Answer» ABCD is a quadrilateral in which P, Q, R and S are mid-points of the sides AB, BC, CD and DA. AC is the diagonal. Show that (i) SR \|\| AC and $S R = \frac{1}{2} A C$ (ii) PQ = SR (iii) PQRS is a parallelogram.

Discussion

7642.	In the adjoining figure, AD and BE are the medians of ΔABC and DF \|\| BE. Show that CF=14AC.
Answer» In the adjoining figure, AD and BE are the medians of $Δ A B C$ and DF \|\| BE. Show that $C F = \frac{1}{4} A C$ .

7642.

In the adjoining figure, AD and BE are the medians of ΔABC and DF || BE. Show that CF=14AC.

Answer»

In the adjoining figure, AD and BE are the medians of $Δ A B C$ and DF || BE. Show that $C F = \frac{1}{4} A C$ .

Discussion

7643.	What should be the generic form of the following equation? (5x+y)7=2
Answer» What should be the generic form of the following equation? $\frac{(5 x + y)}{7} = 2$

Discussion

7644.	The diameters of two cones are equal. If their slant heights are in the ratio 3:4, then find the ratio of their curved surface areas.
Answer» The diameters of two cones are equal. If their slant heights are in the ratio 3:4, then find the ratio of their curved surface areas.

Discussion

7645.	Prove that root 2 is an irrational number
Answer» Prove that root 2 is an irrational number

Discussion

7646.	In the given figure, AOB is a diameter and ABCD is a cyclic quadrilateral. If ∠ADC=120∘ then ∠BAC=? (a) 60∘ (b) 30∘ (c) 20∘ (d) 45∘
Answer» In the given figure, AOB is a diameter and ABCD is a cyclic quadrilateral. If $∠ A D C = 120^{\circ} then ∠ B A C = ?$ (a) $60^{\circ}$ (b) $30^{\circ}$ (c) $20^{\circ}$ (d) $45^{\circ}$

7646.

In the given figure, AOB is a diameter and ABCD is a cyclic quadrilateral. If ∠ADC=120∘ then ∠BAC=? (a) 60∘ (b) 30∘ (c) 20∘ (d) 45∘

Answer»

In the given figure, AOB is a diameter and ABCD is a cyclic quadrilateral. If $∠ A D C = 120^{\circ} then ∠ B A C = ?$

(a) $60^{\circ}$

(b) $30^{\circ}$

(c) $20^{\circ}$

(d) $45^{\circ}$

Discussion

7647.	What's the cost of painting a box which is in the shape of a cuboid of dimensions 3 m×4 m×5 m at a rate of ₹ 5/m2?
Answer» What's the cost of painting a box which is in the shape of a cuboid of dimensions $3 m \times 4 m \times 5 m$ at a rate of $₹ 5 / m^{2}$ ?

Discussion

7648.	Tap on the option that completes the given pattern.
Answer» Tap on the option that completes the given pattern.

Discussion

7649.

How are the following dealt with while preparing the final accounts for the year ended 31st , 2019? RECEIPTS AND PAYMENTS ACCOUNT (AN EXTRACT) for the year ended 31st March, 2019 Dr. Cr. Receipts ₹ Payments ₹ By Payments for Sports Material 1,40,000 BALANCE SHEET (AN EXTRACT) as at 1st April, 2018 Liabilities ₹ Assets ₹ Creditors for Sports Materials 6,000 Sports Materials 8,000 Additional information :Sports Materials in Hand on 31st March, 2019 – ₹ 22,000.

Answer» How are the following dealt with while preparing the final accounts for the year ended 31st , 2019?

RECEIPTS AND PAYMENTS ACCOUNT (AN EXTRACT) for the year ended 31st March, 2019
Dr.			Cr.
Receipts	₹	Payments	₹
		By Payments for Sports Material	1,40,000

BALANCE SHEET (AN EXTRACT) as at 1st April, 2018
Liabilities	₹	Assets	₹

Creditors for Sports Materials	6,000	Sports Materials	8,000

Additional information :

Sports Materials in Hand on 31st March, 2019 – ₹ 22,000.

Discussion

7650.	If two isosceles triangles have a common base, then prove that the line joining their vertices bisects them at right angles.
Answer» If two isosceles triangles have a common base, then prove that the line joining their vertices bisects them at right angles.

Discussion

Explore topic-wise InterviewSolutions in .

The bisects of exterior angle at B and C of ΔABC meet at O. If ∠A = x°, then ∠BOC =(a) 90°+x°2(b) 90°-x°2(c) 180°+x°2(d) 180°-x°2

What is the collective term for aces, jacks, queens and kings in cards? __

88.A sector of a circle of radius R metres is bounded by an Arc A and by two radii OA and OB at an angle beeta radian given that the perimeter of the sector is 18m and that the area of a sector is 8 m square calculate the numerical values of R and beeta

Prove the theorem of intersecting chords.

State whether the following statements are true or false. Justify your answers.(i) Every irrational number is a real number.(ii) Every point on the number line is of the form √m, where ′m′ is a natural number.(iii) Every real number is an irrational number.

Circumference of the base of a cylinder open at the top is 132cm. The sum of the radius and slant height of the cylinder is 41cm. Find the cost of polishing the outer surface of cylinder at the rate of ₹400 per m​​​​​​2.

The number of dimensions of a surface are(a) 1(b) 2(c) 3(d) 0

Question 13Write an equation of a line passing through the point representing solution of the pair of linear equations x + y = 2 and 2x – y = 1, how many such lines can we find?

Question 12Is it possible to construct a triangle with lengths of its sides as 8 cm, 7 cm and 4 cm? Give reason for your answer.

Question 4In the figure, BD and CE intersect each other at the point P. Is ΔPBC∼ΔPDE? Why?

Question 1 (v)Classify 2π as rational or irrational.

Draw a triangle with two sides of 5 cm and 6 cm and the angle between them is 45∘. Also, find the circumradius of the triangle measures.

Question 73Fill in the blanks to make the statements true.If all sides of a quadrilateral are equal, it is a .

Question 8In the figure, l∥m and M is the mid-point of a line segment AB. Show that M is also the mid-point of any line segment CD, having its end points of l and m, respectively.

Locate the position of the ball lying on the given number line.

There is a slide in a park. One of its side walls has been painted in some colour with a message “KEEP THE PARK GREEN AND CLEAN”. If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour.

In the given figure, seg AB≅ seg CB and seg AD≅ seg CD. Prove that △ABD≅△CBD.

In the given figure, line AB || line CD and line PQ is transversal. Measure of one of the angles is given. Hence find the measures of the following angles. (i) ∠ART(ii) ∠CTQ(iii) ∠DTQ(iv) ∠PRB

In the given figure PQ || BC, ∠4 = ∠5 and QB bisects ∠PQC. Find ∠1. 60

The population of Delhi State in different census years is as given below: Census year 1961 1971 1981 1991 2001 Population in Lakhs 30 55 70 110 150

The two lines represented by the equations: 6x - 3y + 10 = 0 and 2x - y + 9 = 0, are _______.

What are the derivations for the formula of mode and median in statistics?

Question 20 The mean of 25 observation is 36. Out of these observations, if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is: A) 23 B) 36 C) 38 D) ​​​​​​​40

The hypotenuse of a right angled triangle is 3.5 metres long and another of its sides is 2.5 metres long.Calculate its perimeter correct to centimetres.

Prove the following identities (1-16)1+cot x+tan x sin x-cos xsec3 x-cosec3 x=sin2 x cos2 x

If the point C(− 2, 3) is equidistant from the points A(3, − 1) and B(x, 8), find the value of x. Also, find the distance BC.

Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see the given figure). Prove that ∠ACP = ∠QCD.

The chord of a circle is equal to its radius. The angle subtended by this chord at the minor arc of the circle is(a) 60°(b) 75°(c) 120°(d) 150°

Factorise:40 + 3x – x2

Question 6 In the figure, ΔABC has sides AB = 7.5 cm, AC = 6.5 cm and BC = 7cm. On base BC a parallelogram DBCE of same area as that of ΔABC is constructed. Find the height DF of the parallelogram.

Two circles of radii 5 cm and 3 cm intersect at two points and the distance betweentheir centres is 4cm. Find the length of the common chord

Choose the correct statements.

If a particular number system having base B, such that(√21)B=(3)10Then the value of B is _____4

A cylindrical pillar is 50cm in diameter and 3.5m in height. Find the coat of painting the curved surface of the pillar at the rate of ₹12.50 per m×m.

Classify the following numbers as rational or irrational (i) √23 (ii) √225(iii) 0.3796

Question 185In the following figure, AB∥DC and AD=BC. Find the value of x.

A triangle and a parallelogram are on the same base and between the same parallels. The ratio of the areas of triangle and parallelogram is(a) 1 : 1(b) 1 : 2(c) 2 : 1(d) 1 : 3

If ABCD (in order) is a quadrilateral inscribed in a circle, then which of the following is/are always true?

Marks obtained by 5 students in a class test out of 25 are 12, 15, 12, 20 and 17 respectively. Find the mode of the given number of observations.

ABCD is a quadrilateral in which P, Q, R and S are mid-points of the sides AB, BC, CD and DA. AC is the diagonal. Show that(i) SR || AC and SR=12AC(ii) PQ = SR(iii) PQRS is a parallelogram.

In the adjoining figure, AD and BE are the medians of ΔABC and DF || BE. Show that CF=14AC.

What should be the generic form of the following equation? (5x+y)7=2

The diameters of two cones are equal. If their slant heights are in the ratio 3:4, then find the ratio of their curved surface areas.

Prove that root 2 is an irrational number

In the given figure, AOB is a diameter and ABCD is a cyclic quadrilateral. If ∠ADC=120∘ then ∠BAC=? (a) 60∘ (b) 30∘ (c) 20∘ (d) 45∘

What's the cost of painting a box which is in the shape of a cuboid of dimensions 3 m×4 m×5 m at a rate of ₹ 5/m2?

Tap on the option that completes the given pattern.

If two isosceles triangles have a common base, then prove that the line joining their vertices bisects them at right angles.

Circumference of the base of a cylinder open at the top is 132cm. The sum of the radius and slant height of the cylinder is 41cm. Find the cost of polishing the outer surface of cylinder at the rate of ₹400 per m2.

Question 20 The mean of 25 observation is 36. Out of these observations, if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is: A) 23 B) 36 C) 38 D) 40