SOLUTION: if you have test scores of 75, 82, and 91 what would the fourth test have to be to get an 80 as your average

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Question 827392: if you have test scores of 75, 82, and 91 what would the fourth test have to be to get an 80 as your average
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
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(75 + 82 + 91 + x)/4 = 80
248 + x = 80*4
x = 80*4 - 248
x = 72
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