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20 March, 11:41

21 is 75% of what number?

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  1. 20 March, 11:49
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    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
  2. 20 March, 12:01
    0
    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.
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