SOLUTION: after taking 3 math quizzes elisa has an average of 89. what must she score on the fourth quiz t raise her average to 91.

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Question 83277: after taking 3 math quizzes elisa has an average of 89. what must she score on the fourth quiz t raise her average to 91.
Answer by stanbon(48558) About Me  (Show Source):
You can put this solution on YOUR website!
after taking 3 math quizzes elisa has an average of 89. what must she score on the fourth quiz t raise her average to 91.
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If she averaged 89 on 3 quizzes she has 3*89 = 267 points.
Let x be the score she needs to average 91:
(267+x)/4 = 91
267+x = 364
x = 97 (score she needs on the 4th quize)
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Cheers,
Stan H.