The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?	Choose the correct choice from the following.
A) 0 B) 9 C) 8 D) 7 E) 6
Average of 20 numbers = 0.   Sum of 20 numbers = (0 * 20)= 
<gadget id="calculator">(0 * 20)</gadget>
<output>0</output>
0.   It is quite possible that 19 of these numbers may be positive and if their sum is a, then 20th number is (- a).   0nswer: 0
<result>A</result>
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?