Question

A number consists of two digit whose sum is 15. if 9 is added to the number, then the digit change their places the number is

Answer 1

the answer is 78 beacause there can be four possibilities in which two digit number can add up to give 15 i.e. 96 + 19 = 115. So there is no such number. But if we add 9 in place of 19 then 78 will be the answer