he average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Select:
A) 0 B) 1 C) 10 D) 19 E) 8
Average of 20 numbers = 0.   Sum of 20 numbers (0 x 20) = 0.   It is quite possible that 19 of these numbers may be positive and if their sum is a the 20th number is (-a).   Answer: Option 19
<result>D</result>
he average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?