You can put this solution on YOUR website! Let the number be x.
So, we can set up the equation as:
(3/4)x = (1/3)x + 15
Solving for x:
3x = (4/3)x + 60 {Multiplying 4 on both the sides}
9x = 4x + 180 {Multiplying 3 on both the sides}
5x = 180
x = 36
Hope this helps~!