SOLUTION: Help me with this one: You are trying to decide how much you must study for Mondays test. So far you have earned test scores of 85%, 92%, and 96%. What must you earn on the 4th tes

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Help me with this one: You are trying to decide how much you must study for Mondays test. So far you have earned test scores of 85%, 92%, and 96%. What must you earn on the 4th tes      Log On


   

Question 1024811: Help me with this one: You are trying to decide how much you must study for Mondays test. So far you have earned test scores of 85%, 92%, and 96%. What must you earn on the 4th test to get exactly a 90% average?
Answer by FrankM(1040) About Me  (Show Source):
You can put this solution on YOUR website!
4 tests must total 4 * 90 or 360.
85%, 92%, and 96% total 273, so you need 360-273 or 87%