Multiple choice general knowledge

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?

  1. 19

  2. 17

  3. 16

  4. 21
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A Correct answer
Explanation

To keep the average of 20 numbers at zero, the sum must be zero. You can have 19 positive numbers as long as the 20th number is a negative value equal to the sum of the others. You cannot have 20 positive numbers because their sum would exceed zero.

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