SOLUTION: A student scores an 84, 85, and 88 on her first three exams. What must she score on her fourth exam to raise her average to 89?

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Question 675539: A student scores an 84, 85, and 88 on her first three exams. What must she score on her fourth exam to raise her average to 89?
Found 2 solutions by ReadingBoosters, Alan3354:
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
%2884%2B85%2B88%2Bx%29%2F4+=+89
...
%28257%2Bx%29%2F4+=+89
...
Multiply both sides by 4
257+x = 89(4)
x = 356 - 257
highlight_green%28x=99%29
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Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A student scores an 84, 85, and 88 on her first three exams. What must she score on her fourth exam to raise her average to 89?
4*89 = 356
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84 + 85 + 88 + Score = 356