SOLUTION: what grade must a student make on his fourth test in order to have an average of 90 if his other grades are 86 85 94?

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Question 475516: what grade must a student make on his fourth test in order to have an average of 90 if his other grades are 86 85 94?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

what grade must a student make on his fourth test in order to have an average of 90 

if his other grades are 86 85 94?

Let x represent the grade on the 4th test

(86 +85 + 94 + x)/4 = 90

(86 +85 + 94 + x)= 360         

               x = 360-265

               x = 95