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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