Multiple choice general knowledge math & puzzles

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

  1. 0

  2. 1

  3. 10

  4. 19
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To have an average of zero, the sum of the 20 numbers must be zero. To maximize the count of positive numbers, 19 numbers can be positive (e.g., all 1s), and the 20th number can be a large negative number (e.g., -19) to balance the sum to zero.

Keep practicing — related questions