21.43% is what you get when you turn the fraction 15/70 into a percentage.
The fraction 15/70 can be reduced to 3/14, which is a simple way to see the same proportion in smaller numbers. Even though it looks different, it still represents the same part of a whole.
Knowing that 15/70 is about 21.43% helps you compare it easily with other percentages, whether you're looking at test scores, discounts, or data in a chart. It shows that the fraction is just under one quarter of the whole.
