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a student has grades of 80, 65, 78 and 92 on four tests, what is the minimum grade she must earn on her next test to ensure an average of 80?
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a student has grades of 80, 65, 78 and 92 on four tests, what is the minimum grade she must earn on her next test to ensure an average of 80?

User Gaborp
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95% i used my math skills
User Eric Skroch
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