Question

The sum of the digits of a two digit number is 15,The number obtained by interchanging the digit exceed the given number by 9.find the number​

Answer 1

Let the digits be x and y

The no is 10x+y

ATQ x+y=15

Also 10y+x-9=10x+y

9x-9y=-9

By solving this we get x =7 and y=8 and the no is 78