SOLUTION: On the first 3 quizzes of her chemistry class, Stephanie got an average score of 88. What does she need on the next quiz to have an overall average of 91?

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Question 842190: On the first 3 quizzes of her chemistry class, Stephanie got an average score of 88.
What does she need on the next quiz to have an overall average of 91?
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
Set x equal the score needed
%2888%2B88%2B88%2Bx%29%2F4+=+91
%28264%2Bx%29%2F4+=+91
multiply each side by 4
264 + x = 364
add -264 to each side
x = 100