Question

A number consists of two digits whose sum is 9. If 27 is subtracted from the number the digits are reversed. Find the number.

Answer 1

Let the one digit of a two digit number is x

Other digit is 9-x

Original two digit number is 10(9 - x) + x

Number obtained after interchanging the digits is  10x + (9 - x)

According to the question:

Therefore the number is 10(9 - 3) + 3 = 63