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.

Example Input: Question: The time taken by a man to row his boat upstream is twice the time taken by him to row the same distance downstream. If the speed of the boat in still water is 42 kmph, find the speed of the stream?

Option A: 12

Option B: 15

Option C: 14

Option D: 18

Option E: 19
Example Output: Option C

Example Input: Question: A and B rent a pasture for 10 months. A put in 80 cows for 7 months. How many can B put in for the remaining 3 months, if he pays half as much again as A?

Option A: 388

Option B: 277

Option C: 266

Option D: 280

Option E: 191
Example Output: Option D

Example Input: Question: The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.7 the sixth number is?

Option A: 11.4

Option B: 11.3

Option C: 13.3

Option D: 11.5

Option E: 11.1
Example Output:
Option C