Question

The sum ofthe digits of two digit is 3 if we subract 9 from the number the digits are interchanged. Find the original number

Answer 1

lets first write down numbers that follow "The sum ofthe digits of two digit is 3"

12

21

30

it cant be 12 because 12-9 = 3

it cant be 30 because 30-9 = 21 and not 03

it is 21 because 21-9 = 12