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eric scored 82 ,74,and 90 in three test . what mark should she score in the fourth test , so that her average mark for the fourth test would be 85

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246/3 = 82

4 * 85 = 340

340 = 246 = 94 needed on fourth test

I don't understand the question

246/3=82
4*85=340
340=246=94

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