SOLUTION: Eve's grades on three tests were 78,93,and 63. What is the lowest grade she can get on the next test to have an average HIGHER THAN 80?

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Question 172316: Eve's grades on three tests were 78,93,and 63. What is the lowest grade she can get on the next test to have an average HIGHER THAN 80?
Found 2 solutions by stanbon, Mathtut:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Eve's grades on three tests were 78,93,and 63. What is the lowest grade she can get on the next test to have an average HIGHER THAN 80?
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Let the next test score be "x".
EQUATION:
(78 + 93 + 63 + x)/4 > 80
234 + x > 320
x > 86
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Cheers,
Stan H.

Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
%2878%2B93%2B63%2Bx%29%2F4%3E80
:
234%2Bx%3E320cross multiplying and combining like terms
:
x%3E86 next test must be higher than 86 points to get higher than an 80 point avg.