how do you find a unknown quantity that helps make up an average when you have the other two?

Answer 1

Well, an average is the sum of (in this case) 3 numbers, divided by 3.

Therefore, the equation would be=

Average given = #1 + #2 + x /ALL DIVIDED BY 3

So, you multiply the given average by 3 which leaves=

Average given (3) = #1 + #2 + x

You add #1 and #2 and subtract it from the average given (3)

Then you are left with x, which is the missing value!

Answer 2

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Answer 3

If you have 2 values and the average, you can find the third. Call the values v1,v2,v3 and the average
vag. Then v1+v2+v3= 3*vag. So
3*vag-v1-v2=v3