SOLUTION: Use an inequality and the five-step process to solve the problem. Jim has gotten scores of 88 and 69 on his first two tests. What score must he get on his third test to keep an ave

Question 257898: Use an inequality and the five-step process to solve the problem. Jim has gotten scores of 88 and 69 on his first two tests. What score must he get on his third test to keep an average of 85 or greater?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
(88+69+X)/3>=85
(157+X)/3>=85
157+X>=85*3
157+X>=255
X>=255-157
X>=98 THE GRADE NEEDED FOR AN AVERAGE OF 85 OR GREATER.
PROOF:
LET X=99
(88+69+99)/3>=85
256/3>=85
85.33>=85

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