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14 July, 20:48

Derek's score on a test was 90 percent. He had 72 questions right. How many problems were on the test?

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  1. 14 July, 21:03
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    90% = 72 questions

    //Find 1%

    1 % = 72 : 90 = 0.8

    //Find 100%

    100% = 0.8 x 100 = 80 questions

    Answer: There were 80 questions
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