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Help 9

 Oct 4, 2018
 #1
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We can look at it this way, NSS

 

The total number of points he needs to average an "80"   =  5 tests * 80 average  = 400

 

So far....he has this many points ⇒   4 tests  *  78 average  = 312

 

So...he needs to make  [400 - 312] =  88  on the last test to get an average of  "80"

 

 

cool cool cool

 Oct 4, 2018

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