SOLUTION: It's been a while! I have 2 known numbers and an average of 3 numbers. The numbers I know are 72 and 73 and the average including the 3rd number is 72.9. Here is my formula and

Question 53800: It's been a while! I have 2 known numbers and an average of 3 numbers. The numbers I know are 72 and 73 and the average including the 3rd number is 72.9. Here is my formula and I'm trying to solve for x:
(72+73+x)/3=72.9.
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
First simplify the parenthese, then multiply both sides by 3, then subtract 145 from both sides like so:

Happy Calculating!
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