The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?
Select:	A) 0	B) 1	C) -1	D) -2	E) 2
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 ?