SOLUTION: Amy's scores on the first four of five 100-point tests were 85, 89, 90, and 81. What score must she receive on the fifth test to have an average of at least 87 points for all the t

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Question 666667: Amy's scores on the first four of five 100-point tests were 85, 89, 90, and 81. What score must she receive on the fifth test to have an average of at least 87 points for all the tests?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
%2885%2B89%2B90%2B81%2Bx%29%2F5+=+87
Solve for x
345%2Bx%29%2F5+=+87
...
Multiply both sides by 5
345+x = 435
x = 435-345
highlight_green%28x+=+90%29 on the 5th test.
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