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A student has taken n tests, and has a 90% average.  What score must the student get on the next test to raise the average to 91%?

 May 31, 2020
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Current total:  t = n*90

 

next score = s

 

New average   av = (t + s)/(n + 1)   

 

So:  91 = (n*90 + s)/(n + 1)

 

Rearrange to find s.  You will need to know n if you want an actual number for s.

 May 31, 2020

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