90 is what percent of 643? (What percent of 643 is 90?)

90 is what percent of 643?

The question here is "90 is what percent of 643?" which is the same as "What percent of 643 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 643 equals 90.

The problem is therefore x% of 643 = 90 which can be written as a function:

		x ∗ 643
		100

= 90

And when we solve the function above for x, we get 13.997. The answer to "90 is what percent of 643?" is therefore:

13.997%

How can we know the answer is correct? We know the answer is correct because 13.997 percent of 643 is 90.

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