Find the average of all the numbers between 11 and 21 which are divisible by 2.  Pick:
A) 15
B) 18
C) 16
D) 22
E) none

Rationale: "sol . average = ( 12 + 14 + 16 + 18 + 20 / 5 ) = 80 / 5 = 16 . answer c"
Answer: C