When average age of 25 members are 0, how many members greater than 0?
Choose the correct choice from the following options:  A) 17  B) 24  C) 21  D) 23  E) 25

Rationale: "average of 25 numbers = 0 . sum of 25 numbers ( 0 x 25 ) = 0 . it is quite possible that 24 of these numbers may be positive and if their sum is a then 25 th number is ( - a ) answer is 24 ( b )"
Answer: B