Question

The tens digit of 2 digit number exceed the unit digit by 5 .if the digit are reverse the new number is less by 45. if the sum of their digit is 9, find the number

Answer 1

Let the unit digit be y and ten's digit be x.
As per the question,
x-y = 5
x+y = 9
By solving both the equations,
2x = 14
x= 7, y = 7-5 = 2.
So, Number will be 72.