Three of four numbers have a sum of 22. if the average of the four numbers is 8, what is the fourth number? don't just answer, tell me how to answer. i think i just need setting up the correct equation

The answer is 10.

if you add 4 numbers that average 8, then they must all add up to 32, because 32/4 = 8. so if three of them add up to 22, then the fourth value must be 10.

hope that helped
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