The average of 20 number is zero of them at the most, how many may be greater than zero ?
Choose the correct choice from the following answers: A) 0 B) 1 C) 10 D) 19 E) 20
Solution   average of 20 numbers = 0.   ∴ Sum of 20 numbers = (0×20) = 0.   it is quite possible that 19 of these number may be positive and if their sum is a, then 20th number is (-a). Answer 19
<result>D</result>
The average of 20 number is zero of them at the most, how many may be greater than zero ?