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
justaguide | Certified Educator
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.