SOLUTION: if you have a mean of 84 on a test and three of the scores are 84, 88, and 80 what is the fourth score

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Question 743990: if you have a mean of 84 on a test and three of the scores are 84, 88, and 80 what is the fourth score
Found 2 solutions by checkley79, tommyt3rd:
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
(84+88+80+X)/4=84
(252+X)/4=84
252+X=4*84
252+X=336
X=336-252
X=84 IS REQUIRED ON THE 4TH. TEST TO AVERAGE 84.

Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
Let's call the unknown value x...

This is our working equation...

%2884%2B88%2B80%2Bx%29%2F4=84
84%2B88%2B80%2Bx=336

x=336-%2884%2B88%2B80%29


x=84