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.

Ex Input:
Question: In the arithmetic sequence t1, t2, t3, ..., tn, t1=23 and tn= tn-1 - 3 for each n > 1. What is the value of n when tn = 8?

 Option A: -1

 Option B: 6

 Option C: 10

 Option D: 14

 Option E: 20

Ex Output:
Option B


Ex Input:
Question: P alone can complete a piece of work in 14 days. Work done by Q alone in one day is equal to one-third of the work done by P alone in one day. In how many days can the work be completed if P and Q work together?

 Option A: 6 (1/4

 Option B: 21/2 days

 Option C: 7 (3/4

 Option D: 8/5 days

 Option E: 9 (3/4

Ex Output:
Option B


Ex Input:
Question: A and B complete a work in 8 days. A alone can do it in 16 days. If both together can do the work in how many days?

 Option A: 3.75 days

 Option B: 3.78 days

 Option C: 5.3 days

 Option D: 3.15 days

 Option E: 2.75 days

Ex Output:

Option C