Question

A two digit number is such that, the sum of its digit is 13.When the digits are interchange, the original number is increased by 9. Find the original number.​

Answer 1

Concept: Mathematical Representation

1. You have a two digit # __
2. The sum of the two digit # = 13
3. The original # increased by 9
4. Hence we must find values that sum to 13. *Note they must be independently standing.
5. 8+5, 9+6, 7+6 , 6+7 , and etc
6. The value must also increase by 9
7. So logically it would be any result that when switched that value would be 76-67= 9.
8. So the value must be 67