instruction:
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.
question:
Question: The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 11 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?

Option A: 23 years

Option B: 24 years

Option C: 25 years

Option D: 26 years

Option E: 27 years
answer:
Option E

question:
Question: If x persons take y days to complete z similar jobs, how long does it take y persons to complete 1 such job?

Option A: z

Option B: x

Option C: x/y

Option D: z/x

Option E: x/z
answer:
Option E

question:
Question: A alone can finish a work in 10 days which B alone can finish in 15 days. If they work together and finish it, then out of a total wages of Rs.3000, A will get:

Option A: Rs.1200

Option B: Rs.1500

Option C: Rs. 1800

Option D: Rs.2000

Option E: None of these
answer:
Option C