SOLUTION: I have 4 tests and my current average is an 83%. What percentages will I have to get in order to get a 90%?

Question 845907: I have 4 tests and my current average is an 83%. What percentages will I have to get in order to get a 90%?
Answer by fcabanski(1391) (Show Source): You can put this solution on YOUR website!
AVG on tests = (earned points)/(number of points possible). For 4 tests, the best possible score is 400 points (100 each).

.83 = x/400 and x = 400*.83 = 332 points.

Call the points you'll receive on the 5th test y. The total possible points in 5 tests is 500. (332+y)/500 = .9

332+y = 450

y = 118

You'd need 118 points out of 100 to achieve a 90%. Unless there's extra credit, you cannot achieve 90%.

The best possible grade you can achieve is 332+100 = 432/500 = .864 - 86.4%

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