678 is 21 percent of what number? (21% of what number is 678?)

678 is 21 percent of what number?

"678 is 21 percent of what number?" is a word problem where the answer is a number. Specifically, if you calculate 21 percent of number (x), you will get 678. Thus, you can illustrate the problem "678 is 21 percent of what number (x)" like this:

21% of x = 678

To calculate 21 percent of a number, we multiply the number by 21 and then divide by 100. Therefore, we can make the following function:

		21 ∗ x
		100

= 678

To solve for x, we first multiply both sides by 100 and then divide both sides by 21 to get the x = 3228.57. Therefore, the answer to 678 is 21 percent of what number? is:

3228.57

If we substitue "what number" in the question "678 is 21 percent of what number?" with 3228.57, we get this sentence: 678 is 21 percent of 3228.57. Since this statement is true, we know that our answer is correct.

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