SOLUTION: jannelles past test scores were 87,85,91,88.What does she need to score on the next to test to average an A? please explain it just doesnt make sense for me

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Question 925285: jannelles past test scores were 87,85,91,88.What does she need to score on the next to test to average an A? please explain it just doesnt make sense for me
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
%2887%2B85%2B91%2B88%2Bx%29%2F5+%3E=+90
x = 450 - (87+85+91+88)
x = 450-351 = 99