SOLUTION: In six examination papers a girl gets 75, 65, 0, 85, 95 & 55. what must she get in the seventh paper so that her average is 64?

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Question 680623: In six examination papers a girl gets 75, 65, 0, 85, 95 & 55. what must she get in the seventh paper so that her average is 64?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
%2875%2B65%2B0%2B85%2B95%2B55%2Bx%29%2F7+=+64
...
%28375%2Bx%29%2F7+=+64
...
Multiply both sides by 7
375 + x = 7(64)
375 + x = 448
x = 448 - 375
highlight_green%28x+=+73%29
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