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Average - General Aptitude

Q1:

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

A 0

B 1

C 10

D 19

ANS:D - 19

Average of 20 numbers = 0.  Sum of 20 numbers (0 x 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).