Question

a number consists of two digits whose sum is 9 if 45 be added to the number the digits are reversed the number is what

Answer 1

this photo will help you...

Answer 2

let the tens digit be x, y the ones digit. Then x+ y = 9, and
10x + y - 27 = 10y + x.
The second equation is equivalent to 9x - 9y = 27, or x - y = 3.
Combining this with the first equation, we get x = 6, and y = 3.
The original number is 63.