math

After six biology tests, Ruben has a mean score of 73. What score does Ruben need on the next test to raise his average (mean) to 75?

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2. 👎
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1. let that score be x

solve for x
(6(73) + x)/7 = 75

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2. 👎
2. 73x6=438

(438+X)/7=75

438X=75

X=87

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2. 👎

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