MATH

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

  1. 0
  2. 5
asked by SAM
  1. 10, 20, 30, 40, 50, 60, 70, 80
    12, 24, 36, 48, 60, 70

    posted by Ms. Sue
  2. Three hours isn't right.

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

    posted by Ms. Sue
  3. It's 4 hours, it's not difficult.

    posted by Bor
  4. Ms Sue, you had it wrong though haha.
    It's:
    15 9
    25 21
    35 33
    45 45
    55
    65
    75
    85

    posted by Bor

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