25 is 32% of what number?

You would set up the proportion 25/X = 32/100.

25*100 is 2500, 32*x is 32x

2500 = 32x

/32 / 32 dividing by 32 on both sides

78.125 = x

You can solve that by cross multiplication.

If 25 is 32%, then x is 100%:

25/32 = x/100

25*100 = 32*x

x = 25*100/32 = 78.125

To check the solution: 78.125 * (32/100) = 25

For this kind of question you just have to multiply times 100/percentage, that's what you always arrive to with the cross multiplication.

So if they asked you, 50 is 25% of what? You'd do 50 * (100/25) = 200.

It's the reverse of finding the percentage of a number.