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Problem-Solving and Data Analysis Difficulty: Easy

21 is 21% of what number?

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Explanation

Choice D is correct. Let x represent the number that 21 is 21% of. It follows that 21 x = 21 100 . Multiplying each side of this equation by x yields 21 = 21 x 100 . Multiplying each side of this equation by 100 yields 2,100 = 21 x . Dividing each side of this equation by 21 yields 100 = x . Therefore, 21 is 21% of 100 .

Choice A is incorrect. 21% of 0 is 0 , not 21 .

Choice B is incorrect. 21% of 1 is 0.21 , not 21 .

Choice C is incorrect. 21% of 42 is 8.82 , not 21 .