The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero? Choices:
A) 8	B) 10	C) 12	D) 15	E) 19
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 then 20th number is (-a).   Option 19
<result>E</result>
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?