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posted by Lisa on Monday, November 29, 2010 at 6:18pm.
Tom had scores of 78, 88, 94 and 79 on his first four science tests. What must he score on the next test to have an average of 88?
5 * 88 = 440 78 + 88 + 94 + 79 = 339 440 - 339 = 101
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