The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?	Choose the correct answer
A) 0
B) -1
C) 1
D) 2
E) none of these
Explanation:   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 ?