Question

The difference between a two digit number and the number obtained by interchanging the digits is 27. What is the difference betw een the two digits of the number?

Options

• 9

• 6

• 12

• 3

Answer 1

3

Explanation:

Let number is 10x + y (x, y are the digits).

Number obtained by interchanging the digits

= 10y + x
∴ 10x + y - (10y + x) = 27

9(x - y) = 27

∴ x - y = 3