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 Q]: Question: The average age of a husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is:

Option A: 19 years

Option B: 17 years

Option C: 25 years

Option D: 15 years

Option E: 12 years
[EX A]: Option A

[EX Q]: Question: A contractor undertakes to built a walls in 50 days. He employs 60 peoples for the same. However after 25 days he finds that only 40% of the work is complete. How many more man need to be employed to complete the work in time?

Option A: 25

Option B: 90

Option C: 35

Option D: 20

Option E: None of these
[EX A]: Option B

[EX Q]: Question: Which of the following statements is definitely true , if A is the brother of B and C. Q is B's son and R is A's father.

Option A: A is B's son

Option B: A is C's son

Option C: A is B's nephew

Option D: A is B's niece

Option E: A is Q's uncle
[EX A]:
Option E