math

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on his first exam, he studied for 10 hours and went to tell the mall for 4hours, and got a score of 85. how long should he study to get a grade of 96 and go to the mall for 17 hours?

grade varies directly with studying and inversely with going to the mall.

is the answer 48hrs?

  • math -

    Mark = k(s)/m, where s is number of hrs studying, m is the number of hrs at the mall, and k is a constant
    given: Mark = 85, s=10, m=4
    85 = k(10)/4
    k = 34

    Mark = 34s/m
    96 = 34s/17
    s = 48 hrs

    (a rather silly question)

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