SOLUTION: a mathematics instructor asserted that students test grades are directly proportional to the amount of time spend studying. Brent studies for 15hr for a final exam and got a score

Question 810323: a mathematics instructor asserted that students test grades are directly proportional to the amount of time spend studying. Brent studies for 15hr for a final exam and got a score of 75. At this rate , waht score would he have recieved if he studied for 18 hr?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
15/75 = 18/s
s = 75(18/15) = 90
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