When average age of 21 members are 0, how many members greater than 0? Choose one:
A) 17
B) 20
C) 21
D) 24
E) 25
Average of 21 numbers = 0.   Sum of 21 numbers (0 x 21) = 0.   It is quite possible that 20 of these numbers may be positive and if their sum is a then 21st number is (-a)   Answer is 20 (20)
<result>B</result>
When average age of 21 members are 0, how many members greater than 0?