Average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?

– by 0

A. 12
B. 19
C. 30
D. 45

Average of 20 numbers = 0

Sum of 20 numbers = (0 * 20) = 0
It is quite possible that 19 of these numbers may be positive and if their sum is a, then 20th number is (-a).

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