90 is what percent of 420? (What percent of 420 is 90?)

90 is what percent of 420?

The question here is "90 is what percent of 420?" which is the same as "What percent of 420 is 90?" This math word problem is asking "what percent" so we know that the answer should be a percent. Specifically, what percent (x) of 420 equals 90.

The problem is therefore x% of 420 = 90 which can be written as a function:

		x ∗ 420
		100

= 90

And when we solve the function above for x, we get 21.429. The answer to "90 is what percent of 420?" is therefore:

21.429%

How can we know the answer is correct? We know the answer is correct because 21.429 percent of 420 is 90.

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