20 is what percent of 400? (What percent of 400 is 20?)

20 is what percent of 400?

The question here is "20 is what percent of 400?" which is the same as "What percent of 400 is 20?" This math word problem is asking "what percent" so we know that the answer should be a percent. Specifically, what percent (x) of 400 equals 20.

The problem is therefore x% of 400 = 20 which can be written as a function:

		x ∗ 400
		100

= 20

And when we solve the function above for x, we get 5. The answer to "20 is what percent of 400?" is therefore:

5%

How can we know the answer is correct? We know the answer is correct because 5 percent of 400 is 20.

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