Question 539310
Manuel's quiz scores are 76, 81, and 77. What grade must he get on his fourth quiz to get an average of 80?
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76 + 81 + 77 = 234
4*80 = 320
320 - 234 = 86 needed
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or,
(76 + 81 + 77 + s)/4 = 80
234 + s = 320
s = 86