You can put this solution on YOUR website! Solution: Denote the unknown number x, base on the given data write the equation:
Multiply both sides with LCD 12.
8x-3x=120
5x=120 Divide both sides with 5
x=24
Check: 2/3*24-10=1/4*24 => 16-10=6 => 6=6.
Answer: The unknown number is 24