You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[Q]: Question: The average age of 15 students of a class is 15 years. Out of these, the average age of 4 students is 14 years and that of the other 10 students is 16 years, The age of the 15th student is

 Option A: 11

 Option B: 12

 Option C: 9

 Option D: 14

 Option E: 15
[A]: Option C


[Q]: Question: By how much is three-fifth of 370 greater than four-seventh of 210 ?

 Option A: 90

 Option B: 100

 Option C: 110

 Option D: 120

 Option E: 102
[A]: Option E


[Q]: Question: What is the next number: 3, 18, 258, __

 Option A: 2928

 Option B: 3638

 Option C: 4098

 Option D: 4418

 Option E: 5378
[A]:
Option C