math

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Ben can complete 3 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 15 math problems?

  • math -

    15/3 = 5

    It will take him 5 times 20 minutes to finish.

    You could also set up a proportion. Cross multiply and solve for x.

    3/20 = 15/x

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