Question

sum of digits of two digit number is 9 when the digits are interchanged the new number is greater than the original number by 9 find the original number
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Answer 1

Answer:

Maths keeps one mentally active. 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.