Subject: mathqa
Question: the average age of 15 students of a class is 14 years . out of these , the average age of 5 students is 14 years and that of the other 9 students is 16 years . tee age of the 15 th student is ?
Option: 
A: 7 years
B: 4 years
C: 3 years
D: 5 years
Answer: B