SOLUTION: if i took four quizzes and there score averages out to an 82, what do i have to get on the next quiz to get it to average to an 85

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Question 513918: if i took four quizzes and there score averages out to an 82, what do i have to get on the next quiz to get it to average to an 85
Found 2 solutions by stanbon, Earlsdon:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
if i took four quizzes and there score averages out to an 82, what do i have to get on the next quiz to get it to average to an 85
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Total points from the 4 quizzes: 4*82 = 328
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Equation:
(328+x)/5 = 85
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328 + x = 415
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x = 87
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Cheers,
Stan H.
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Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
First, let's find the sum of your four quizzes (a+b+c+d):
%28a%2Bb%2Bc%2Bd%29%2F4+=+82 The average of the first four quizzes is 82.
a%2Bb%2Bc%2Bd+=+328 Now let's call the score on your fifth quiz, x, so...
%28328%2Bx%29%2F5+=+85 Multiply by 5.
328%2Bx+=+425 Subtract 328.
x+=+97
You will need to get 97 on your next quiz to attain an overall average of 85.