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If John gets a 97 on his next math test, his average will be 90. If he gets 73, his average will be 87. How many tests has John already taken?

 May 7, 2020
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[m*n+97] / (n+1) =90, 

[m*n+73] / (n+1) =87, solve for n, m

 

n = 7 Number of tests before the last one

m = 89 - His average before the 8th and last test.

 May 7, 2020

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