11. A contractor undertakes to build a wall1000 m long in 50 days. He

1.	11. A contractor undertakes to build a wall1000 m long in 50 days. He employs 56 men,but at the end of 27 days, he finds that only448 m of wall is built. How many extra menmust the contractor employ so that the wall iscompleted in time?
Answer» Wall Built = 448m; Time Taken =27 days; Men working = 56 men Wall builtby 56 men in 1 day = 448/27mWall built by 1 man in 1 day = 448/(27x56) = 56/189m Now,Wall left to be built = 552m; Time left = 23 days;Total men required to complete the rest of work = x Wall built by x no. of men in 1 day = 56x/189mWall built by x no. of men in 23 days =(56*23)x/189 = 1288x/189Thus,1288x/189 = 552 (As x no. of men have to build 552m of wall)1288x = 104328x = 104328/1288x= 81menTherefore, extra men required = 81-56 = 25 men

11. A contractor undertakes to build a wall1000 m long in 50 days. He employs 56 men,but at the end of 27 days, he finds that only448 m of wall is built. How many extra menmust the contractor employ so that the wall iscompleted in time?

Answer»

Wall Built = 448m; Time Taken =27 days; Men working = 56 men

Wall builtby 56 men in 1 day = 448/27mWall built by 1 man in 1 day = 448/(27x56) = 56/189m

Now,Wall left to be built = 552m; Time left = 23 days;Total men required to complete the rest of work = x

Wall built by x no. of men in 1 day = 56x/189mWall built by x no. of men in 23 days =(56*23)x/189 = 1288x/189Thus,1288x/189 = 552 (As x no. of men have to build 552m of wall)1288x = 104328x = 104328/1288x= 81menTherefore, extra men required = 81-56 = 25 men

Discussion

No Comment Found

Related InterviewSolutions

The bisector of an exterior angle at the vertex of an isosceles triangle isparallel to its base. State and prove its converse.
( x - 5 ) ( x - 6 ) = \frac 25 ( 24 ) ^ 2
Write any two rational numbers which are between 2.3 and 2.4.
3. State exterior angle property of a triangle
Mathematics for Class 7and name2. Given below are pairs of congruentriangles. State the property of congruencethe congruent triangles in each case.Q.50 50В 70.60 60
8D180 (linear pair property),Hence, AD bisects BC at right angles.EXERCISE 9(B). Given below are pairs of congruent triangles. State the property of congruence and name thecongruent triangles in each case
10. State the property illustrated in the following.-5 9 9,56 24 24X--=
3. Write two rational numbers between :NE(b)- and -COIN
mine the longest tape which can be used to measure exactly the lengths 7 m
Find the general solution of the equation: sin x + sin 3x + sin 5x-0.+ sin 3x sin 5x 0