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Malena has taken four tests so far. Her scores are 92%,80%,88%,93%. What score does she need to get on the fifth test to raise her average grade to 90%?
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Nov 4, 2017
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Malena has taken four tests so far. Her scores are 92%,80%,88%,93%. What score does she need to get on the fifth test to raise her average grade to 90%?
Mathematics
middle-school
Christinabo
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To calculate the average you add up all the scores and divide by the number of scores (5)
add all the current test scores and allow X to be the unknown score:
92+80+88+93+X: or 353 + X
set up equation:
(353+X)
______ = 90
5
Multiply both side of the equation by 5 to clear the fraction resulting in:
353+X=450
Subtract 353 from both sides of the equation:
x = 97
So the test score needed to get a 90 average is 97.
SimonAlfie
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Nov 10, 2017
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