SOLUTION: marks test scores were 87, 87, 67,88,78 . what does he need on his next test to average 80?

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Question 555624: marks test scores were 87, 87, 67,88,78 . what does he need on his next test to average 80?
Answer by Alan3354(69443) About Me  (Show Source):
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marks test scores were 87, 87, 67,88,78 . what does he need on his next test to average 80?
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An 80 average for 6 tests --> 6*80 = 480 points.
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87 + 87 + 67 + 88 + 78 = 407
480 - 407 = 73 needed
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What's the highest average he can make in the class?