15/20 =75/100 or 75%
Why?
What you do with the denominator is what you do with the numerator. Since 100/20 (100 divided by 20) = 5 then you multiply the denominator (20) by 5 which is obviously 100 and the numerator by 5 too and you get 75. 75/100 is 75%. Look at the work below.
15 time 5 = 75
--- --- = ---
20 time 5 = 100
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