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Julie's average for the first four tests is 88.5 . If she wants an average of at least 90 in the five tests,what score must she get in her last test?

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Jers15viz
2[(88.5+x)/2=90]
88.5+x=180
x=91.5

She must get at least a score of 91.5 on her fifth test to earn an average of at least 90.

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