125% of what number is 25?

Let the number be=n

125%n=25

1.25n=25 divide both sides by 1.25

n=25/1.25

n=20

For this, we must solve...

125/100=25/x

Cross multiply by multiplying each numerator by the other fraction's denominator and you get...

125x=2500

Sivide by 125 on each side...

x=20

I think you can use the work I've shown you here to figure out the other problems you have. 

25is125%of what number