SOLUTION: Destiny earned a 90, 88, and 77 on her first three test. What does she need to earn on her fourth test to have an average of 88?

Question 995273: Destiny earned a 90, 88, and 77 on her first three test. What does she need to earn on her fourth test to have an average of 88?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
To average 88 over 4 tests, the sum of the scores must be:
(4)(88)=352
.
The current sum of her grades is:
90+88+77=255
.
To average 88, her score on the final test must be:
352-255=97
.
ANSWER: She must score 97 on the fourth test to average 88.
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