Question

The digits in a two-digit number add up to 9. If we interchange the digits in the number, we obtain a new number that is 63 greater than the original number. Find the original number.

Answer 1

Step-by-step explanation:

Let the two digits of the number be x and y. 2x = 12, or x = 3, so y = 9–6 = 3. So the original number is 36 which on reversing becomes 63 and 63–36 = 27.