MATH

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Terry has completed 15 homework problems, and Susan has completed 9. Terry is completing 10 problems per hour, and Susan is completing 12 per hour. After how many hours will Terry and Susan have completed the same number of problems?
a. 3 hrs**** b. 4 hrs c. 5 hrs d 10 hrs

  • MATH -

    10, 20, 30, 40, 50, 60, 70, 80
    12, 24, 36, 48, 60, 70

  • MATH -

    Three hours isn't right.

    How many hours will it take for each of them to finish 60 problems?

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