SOLUTION: gerald has an average of 87 after 6 tests. What does Gerald need to get on the next test to finish with an average of 80 on all 7 tests?

Question 963884: gerald has an average of 87 after 6 tests. What does Gerald need to get on the next test to finish with an average of 80 on all 7 tests?
Answer by LinnW(1048) (Show Source): You can put this solution on YOUR website!
(6 * 87 plus the next test score )/7 = the new average score.
We want

multiply each side by 7

add -522 to each side

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