Multiple choice general knowledge math & puzzles

2.What number must be added to 6, 16 and 8 to attain an average of 13?

  1. 22

  2. 21

  3. 19

  4. 26
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A Correct answer
Explanation

Let x be the number to add. New average = (6 + 16 + 8 + x)/4 = 13. Therefore: 30 + x = 52, so x = 22. Adding 22 to the sum of 30 gives 52, which divided by 4 equals 13. This is a basic average problem - find the missing value that achieves a target mean.

AI explanation

To reach an average of 13 across 4 numbers, the total sum must be 13 x 4 = 52. Since 6 + 16 + 8 = 30, the fourth number needed is 52 - 30 = 22.

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