so all you need to do is find the fraction equal to 3/20. they gave you a numerator for the new fraction, 15. now you need to find the denominator. for a fraction to be equal you have to do the same things to the top and the bottom. so how do you make 3 into 15? you multiply by 5! so when we do the same thing to the bottom number, or the 20, we get 100. so the new fraction is 15/100.
