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

Question

 Please show your work.  

Answer 1

n represents the missing number

(22 + n) / 4 = 8    

22 + n = 32          multiply both sides by 4

n = 10                  subtract 22 from both sides