SOLUTION: Francis averaged 78 (out of 100) on his first three exams. What score will Francis need on his fourth exam to bring his average up to 80?

SOLUTION: Francis averaged 78 (out of 100) on his first three exams. What score will Francis need on his fourth exam to bring his average up to 80?

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Question 557636: Francis averaged 78 (out of 100) on his first three exams. What score will Francis need on his fourth exam to bring his average up to 80?
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
(78+78+78+x)/4=80
234+x=80*4
x=86
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