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3 August, 12:26

Scooby made 70 percent on his science test. if he got 21 problems correct how many problems are on the test

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  1. 3 August, 14:01
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    Since the score is 21 out of an unknown number, and the percantage is 70%, you set. 7 equal to the score (21/x), and solve for x

    .7 = 21/x

    Multiply both sides by x

    .7x = 21

    Divide both sides by. 7

    x = 30
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