SOLUTION: i got a 100 on my first test. I got 77 score on my second test. what will I need on my third test to average an 80

SOLUTION: i got a 100 on my first test. I got 77 score on my second test. what will I need on my third test to average an 80

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Question 853819: i got a 100 on my first test. I got 77 score on my second test. what will I need on my third test to average an 80
Answer by LinnW(1048) (Show Source): You can put this solution on YOUR website!
The sum of the test scores divided by the number of tests gives
the average.
(100 + 77 + x)/3 = 80
(177 + x)/3 = 80
multiply each side by 3
177 + x = 240
add -177 to each side
x = 240 - 177
x = 63

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