Question

The sum of a two digit and number obtainted by reserving it digit is 121.Find the number of its unit place digit geartger than tens olace by 7

Answer 1

Answer: 29

Step-by-step explanation:

Let the unit digit is ‘x’ and the 10th digit is ‘y’

The number is 10 y +x

Reversed number is 10 x+y

Given 11 x+11 y =121`

x+y=11 [dividing by 11]------(1)

Also x-y=7-----(2)

solving (2) we get

x=7+y

Putting value of x in (1),we get

7+y+y=11

2y=4

y=2

x=7+y

x=9

x=9 and y=2

The number is 29 [check 29+92=121, 9–2=7]