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: The cost of Type 1 material is Rs. 15 per kg and Type 2 material is Rs.20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then what is the price per kg of the mixed variety of material?

Option A: Rs. 19

Option B: Rs. 16

Option C: Rs. 18

Option D: Rs. 17

Option E: Rs. 21

Ex Output:
Option C

Ex Input:
Question: A board of length L feet is cut into two pieces such that the length of piece A is 4 feet less than three times the length of piece B. Which of the following is the length, in feet, of piece A?

Option A: (L+4

Option B: (L-4

Option C: (3L-4

Option D: (3L-1

Option E: (3L+4

Ex Output:
Option C

Ex Input:
Question: At a conference, the only events scheduled for the day are seminars and breaks. All seminars are the same length and are 10 times as long as each break. A break must be between two consecutive seminars. If the first seminar begins at 9:00 a.m. and the third one ends at 11:00 a.m., how long will the conference last if there are a total of 6 seminars that day?

Option A: hours and 15 minutes

Option B: hours and 20 minutes

Option C: hours and 25 minutes

Option D: hours and 30 minutes

Option E: hours and 35 minutes

Ex Output:
Option E