The average age of 20 persons in a office is 15 years. Out of these, the average age of 5 of them is 14 years and that of the other 9 persons is 16 years. The age of the 15th person is?	Choose the correct choice from the following answers:  A) 79  B) 86  C) 95  D) 72  E) 80

Rationale: "age of the 15 th student = 20 * 15 - ( 14 * 5 + 16 * 9 ) = 300 - 214 = 86 years answer is b"
Answer: B