Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number?

a) 4

b) 6

c) 8

d) 10

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The average of the four numbers is 8. This gives the sum of all the four numbers as 8*4 = 32.

As the sum of three of the numbers is 22, the fourth number is 32 - 22 = 10.

**The correct answer is option d.**

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