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If he wants a 90% average for the four tests, the least he can afford to get on the

fourth one is 99%.

(87 + 87 + 87 + 99) / 4 = 360/4 = 90%

Good luck !

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โˆ™ 2010-02-16 19:16:30
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Q: Johns average score on three tests is 87 percent What is the least he can score on his fourth test so that his average grade will be at least 90 percent?
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