im very confused about this problem pls help
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Let X be her next score then (78+87+89+X)/4 percent is the average, which must be at least 85%, therefore (254+X)/4≥85. Multiply through by 4: 254+X≥340 and X≥340-254, so X≥86%.

She must score at least 86% on the next test to average 85% over four tests.

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