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21% of 400 = 84

To solve this problem, you can either set up an equation or think it through and save some paper and time.

1. Setup

21 84

--- = ---

100 x

2. Remove denominators (by multiplying both sides by each)

21*x = 100*84

or 21x = 8400

3. Solve for x by dividing each side by 21

x = 8400/21

x = 400

The way I quickly thought through the answer was to consider what 21% means: 21/100. So, the ratio between 21 and 100 needs to be applied to 84. I did this:

100/21 = 4.76

4.76 * 84 = 400

If that's more than you were looking for, sorry, but the answer is 400.

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Wiki User

16y ago

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More answers

21 / 0.84 = 25

Therefore, 21 is 84 percent of 25.

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Wiki User

15y ago
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Q: 21 is 84 percent of what number?
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