The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?
Options:
A) 0	B) 1	C) 9	D) 10	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).   answer: option 19
<result>E</result>
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?