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21 is 75% of what number?

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lilsquirt171

21 is 75% of 28. The way I did it was to just divide 21÷3 (the 75%), which I know will evenly divide into 7, and added 7 (the missing 25%), to get my answer of 28. You can go back and check  your work in that 100 ÷ 4 = 5, and 28 ÷ 4 = 7. Not sure if that's how your teacher wants you to work it but that's the correct answer. (:

Ian154

The easiest way for me is to remember is means an equal sign and of means multiplication.  21 = .75 * n  First you want to multiply .75 by n. To get .75n 21 = .75n Next you are going to divide both by .75. Which is 28 and n Now the final answer is n=28

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