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Maria answered all the problems on her math test. She answered 80 percent of the problems correctly. If she answered 6 problems incorrectly, how many problems were on the test?

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2 answers
  1. Let x = the total number of problems.

    0.2x = 6

    x = 6/0.2

    x = 30

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    Ms. Sue
  2. This is a direct proportion problem.

    80% correct means 100-80=20% incorrect.

    By direct proportions,
    20% : 6 problems
    100% : X problems?

    Cross multiply to get
    X=6*100/20=30

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