I'm doing my math homework. 25*f=100 or twenty-five times something equals one hundred? Please help me.

if 25f = 100

f = 25f/25 = 100/25 = 4

If I told you 2*f=10, would you have trouble finding f? Probably not. So, when confronted with uncomfortable numbers, try solving the same problem with easy numbers, and then follow the same steps.