# math

After his six biology tests, Ruben has a mean score of 78. What Score does Ruben need on the next test to raise his average (mean) to 80?

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1. He has a total score so far of 468.

After the seventh test he wants a total of 560.

560 - 468 = 92

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2. he needs to add 2 points to each of the 6 tests already taken

plus, he needs to score the 80 average

(2 * 6) + 80 = ?

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2. 👎

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