SOLUTION: Ken received grades of 90,88,and 75 on three tests. What grade must he receive on the next test so that his average for these four tests is 85?

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Question 654009: Ken received grades of 90,88,and 75 on three tests. What grade must he receive on the next test
so that his average for these four tests is 85?
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
(90+88+75+X)/4=85
(253+X)/4=85 CROSS MULTIPLY.
253+X=4*85
253+X=340
X=340-253
X=87 ANS. FOR THE FINAL TEST GRADE.