SOLUTION: if a student makes an 83, 82, 75 on a test what must he make on the next test to have a 89 average

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Question 358909: if a student makes an 83, 82, 75 on a test what must he make on the next test to have a 89 average
Answer by neatmath(302) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the missing test score.

Then our four test scores are 83, 82, 75, and x

We need to use this to find the average:

%2883%2B82%2B75%2Bx%29%2F4=89

%28240%2Bx%29%2F4=89

240%2Bx=356

x=116

He would need a score of 116 on the final test to average 89, which he may be able to achieve with extra credit, I suppose.

If there is no extra credit, the highest average he could end up with would be:

%2883%2B82%2B75%2B100%29%2F4 which would be 85 (which should still be a grade of B)!

I hope this helps!