Find all the two digit numbers,whose digit in the tens place is twice

1.	Find all the two digit numbers,whose digit in the tens place is twice the digit in the units place .
Answer» Step-by-step explanation: LET 10y+x be the digit number. It is given that the ten's PLACE is TWICE the digit at unit's place. i.e. y=2x ------(1) Also, (10y+x)+(10x+y)=66 10y+x+10x+y=66 11y+11x=66 ⇒x+y=6 ⇒x+2x=6 [from (1)] ⇒3x=6 ⇒x=2 Form (1), y=2(2)=4 The required number =10(4)+2=42

Find all the two digit numbers,whose digit in the tens place is twice the digit in the units place .

Answer»

Step-by-step explanation:

LET 10y+x be the digit number.

It is given that the ten's PLACE is TWICE the digit at unit's

place.

i.e. y=2x ------(1)

Also, (10y+x)+(10x+y)=66

10y+x+10x+y=66

11y+11x=66

⇒x+y=6

⇒x+2x=6 [from (1)]

⇒3x=6

⇒x=2

Form (1), y=2(2)=4

The required number =10(4)+2=42

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Find all the two digit numbers,whose digit in the tens place is twice the digit in the units place .

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