Need help for Excel Formula

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Jul 30, 2015
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Can someone help me with a formula for this situation.
A=1
B=0
C=-1
example:
if i have 5a, 1b and 2c..what will be the formula for the average.

and another formula for:

D= #'s of A for the average to reach 80%
example:
*using manual computation*
5a, 1b and 2c, the average is 37.5%, so how many A do i need to reach 80%?

I'm just new with Excel, please help.

Thanks in advance!
 
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