Question

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

Answer 1

10

Explanation:

First you do 8 × 4, this gives the total of the four numbers.

`8 * 4 = 32`

Then, subtract the total of 3 of the numbers from the total of 4 of the numbers.

`32 - 22 = 10`