Question

sum of the two digits of a two-digit number is 17 if the digits are reversed the new number so formed increase by 9 find the number

Answer 1

Answer:

For the reversal of the digits, base 10, to result in an increment of 9, the digits must differ by one. As it happens, the problem is simplified by the fact that only two single digits sum to 17. The answer is 89. 89 + 9 = 98 (it has increase by 9).