Posted by **rock** on Tuesday, August 2, 2011 at 12:30pm.

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 -
**Reiny**, Tuesday, August 2, 2011 at 1:10pm
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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