Question 175079: Your grades on five math tests are 95,86,79,88,83. What grad do you need on the sixth test to have an average of 90%.
Found 2 solutions by SAT Math Tutor, stanbon:
Answer by SAT Math Tutor(36)   (Show Source):
You can put this solution on YOUR website! To score an average of 90, you need 90*6 = 540 points.
So far you have 95 + 86 + 79 + 88 + 83 = 431 points.
You would need 540 - 431 = 109 points which is only possibly if the teacher gives a bonus question!
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Your grades on five math tests are 95,86,79,88,83. What grade do you need on the sixth test to have an average of 90%.
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Let the grade on the 6th test be "x".
EQUATION:
(95+86+79+88 + 83 + x)/6 = 90
431 + x = 540
x = 109
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You would need a grade of 109 on the 6th test.
Cheers,
Stan H.
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