Question 1185206: A student has test grades of 91,86 and 85,what must be her next test grade in order to have a 90 average
Found 2 solutions by Alan3354, greenestamps:
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! A student has test grades of 91,86 and 85,what must be her next test grade in order to have a 90 average
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G = the next grade
(91 + 86 + 85 + G)/4 = 90
Solve for G
Answer by greenestamps(13198)  (Show Source):
You can put this solution on YOUR website!
The first grade, 91, is +1 compared to the desired average.
The second grade, 86, is -4 compared to the desired average.
The third grade, 85, is -5 compared to the desired average.
All together, the three grades are +1-4-5 = -8 compared to the desired average.
That means the next score has to be +8 compared to the desired average.
ANSWER: 90+8 = 98
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