SOLUTION: I have four test grades of 80, 80, 85, and 75. What will i need to get on my next test for a overall average of 70?

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Question 883188: I have four test grades of 80, 80, 85, and 75. What will i need to get on my next test for a overall average of 70?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Find the average of all 5 grades,
%2880%2B80%2B85%2B75%2BX%29%2F5=70
320%2BX=350
X=30