A student has gotten the following grades on his tests. What is the minimum grade he must get on the last test in order to have an average of 81? 84, 87, 72, 75 The minimum grade he must get on the last test in order to have an average of 81 is (Simplify your answer.)

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A: Given Data : Kathlyn : 91, 90, 94, 93, 92  Renier : 92, 92, 90, 94, 92

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A: topic - average and comparison

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A: topic - inequality

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