30 is what percent of 40? (What percent of 40 is 30?)

30 is what percent of 40?

The question here is "30 is what percent of 40?" which is the same as "What percent of 40 is 30?" This math word problem is asking "what percent" so we know that the answer should be a percent. Specifically, what percent (x) of 40 equals 30.

The problem is therefore x% of 40 = 30 which can be written as a function:

		x ∗ 40
		100

= 30

And when we solve the function above for x, we get 75. The answer to "30 is what percent of 40?" is therefore:

75%

How can we know the answer is correct? We know the answer is correct because 75 percent of 40 is 30.

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