The average of 20 numbers is zero. Of them, How many of them may be greater than zero, at the most?	Choose the correct choice from the following choices:
A) 1
B) 20
C) 0
D) 19
E) 18
Explanation:   Average of 20 numbers = 0   =&gt;Sum of 20 numbers/20=0   Hence at the most, there can be 19 positive numbers.   (Such that if the sum of these 19 positive numbers is x, 20th number will be -x)   ANSWER IS 19
<result>D</result>
The average of 20 numbers is zero. Of them, How many of them may be greater than zero, at the most?