The average age of 15 students of a class is 15 years. Out of these, the average age of 7 students is 14 years and that of the other 7 students is 16 years. The age of the 15th student is  Choose the correct choice from the following choices:	A) 9 years	B) 11 years	C) 15 years	D) 21 years	E) 25 years

Rationale: "solution age of the 15 th student = [ 15 x 15 - ( 14 x 7 + 16 x 7 ) ] = ( 225 - 210 ) = 15 years . answer c"
Answer: C