Multiple choice general knowledge

Jeff picked four numbers out of a hat. The average of the four numbers is 9. If three of the numbers are 5, 9 and 12, then what is the fourth number?

  1. 10

  2. 7

  3. 11

  4. 13
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The average of four numbers is 9, so their sum is 4 × 9 = 36. Three numbers are given: 5 + 9 + 12 = 26. The fourth number is 36 - 26 = 10. Option A is correct.

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