The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero? Choose the most appropriate option:  A) 7  B) 4  C) 12  D) 19  E) 28
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).   Answer: 19
<result>D</result>
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?