Tom wrote a two-digit number.He multiplied it by 3, added 18, and divided by 8. His final answer was 9. What number did Tom write?
two digit number --- x
multiplied it by 2 --- 2x
added 18 ----- 2x + 18
divided by 8 --- (2x+18)/8
(2x+18)/8 = 9
2x + 18 = 72
2x = 54
x = 27