<PRE><B>Question 458571</B>
if you have an average of 87% on 3 tests what score will you need to get on your last test to earn a 90% average
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An average of 87 on 3 tests means you have 3*87 = 261 points
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An average of 90 on 4 tests means you need 4*90 = 360 points
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You need a 99 on the last test to average 90 on the 4 tests.
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Cheers,
Stan H.</PRE>