5 goes into both of these numbers. So 20 over 15 each divided by 5 is 4 over 3, which is the lowest they can both go. If you wish to make that a mixed number instead of an improper fraction, just think; how many times can 3 go into 4 (and stay a whole number)? once. How many is left over afterwards? one. As a mixed number you have 1 and 1 thirds (keep the same denominator).
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Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 5, 15/20 is equal to 3/4 or three quarters.