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23 March, 17:38

Grover has scores of 72, 86, and 78 on 3 tests. what score must he make on the next test in order to have an average of 80?

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  1. 23 March, 17:52
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    Let x = the next score

    If (72 + 86 + 78 + x) : 4 = 80

    ⇒ 236 + x = (80 * 4)

    ⇒ 236 + x = 320

    ⇒ x = 320 - 236

    = 84

    ∴ he needs to get 84 on the next test to get an 80 average
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