Multiple choice

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

  1. 4

  2. 6

  3. 8

  4. 10
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D Correct answer
Explanation

Sum of 4 numbers = 4 * 8 = 32. Sum of 3 numbers = 22. Fourth number = 32 - 22 = 10.

AI explanation

Using the formula for the sum of terms, the total of the four numbers is 4 multiplied by 8, yielding 32. Since the sum of three of the numbers is 22, subtracting this from the total gives the fourth number. The fourth number is 32 minus 22, which is 10.

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