SOLUTION: Your quiz grades are 73,75,89 and 91.What is the lowest grade you can receive on the last quiz and still achieve an average of at least 85?

Algebra ->  Problems-with-consecutive-odd-even-integers -> SOLUTION: Your quiz grades are 73,75,89 and 91.What is the lowest grade you can receive on the last quiz and still achieve an average of at least 85?      Log On


   

Question 343572: Your quiz grades are 73,75,89 and 91.What is the lowest grade you can receive on the last quiz and still achieve an average of at least 85?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
(73+75+89+91+x)/5>85
(328+X)/5>85 CROSS MULTIPLY.
328+X>5*85
328+X>425
X>425-328
X>97 ANS. FOR THE FINAL TEST GRADE.
PROOF:
LET X=98
(73+75+89+91+98)/5>85
426/5>85
85.2>85