The average age of 15 students of a class is 15 years. Out of these, the average age of 6 students is 14 years and that of the other 8 students is 16 years. The age of the 15th student is	Select
A) 9 years  B) 13 years  C) 14 years  D) 21 years  E) 25 years

Rationale: "solution age of the 15 th student = [ 15 x 15 - ( 14 x 6 + 16 x 8 ) ] = ( 225 - 212 ) = 13 years . answer b"
Answer: B