SOLUTION: If my average of two marks is 77 and one of the marks is 70, what is the other mark to make that figure? Thanks so much

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Question 866256: If my average of two marks is 77 and one of the marks is 70, what is the other mark to make that figure? Thanks so much
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If my average of two marks is 77 and one of the marks is 70, what is the other mark to make that figure? Thanks so much
:
If the other mark = x
%28x%2B70%29%2F2 = 77
mult both sides by 2, and find x