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: A and B complete a job in 6 days. A alone can do the job in 15 days. If B works alone, how many days will it take to complete the job?

Option A: 8

Option B: 10

Option C: 12

Option D: 14

Option E: 16
[EX A]: Option B

[EX Q]: Question: If p/8 = r/2 and r = 0.75s, what is the ratio of p to r to s?

Option A: 2 : 3 : 4

Option B: 8 : 12 : 9

Option C: 24 : 6 : 8

Option D: 6 : 4 : 3

Option E: 12 : 8 : 3
[EX A]: Option C

[EX Q]: Question: A man is 24 years older than his son. In two years, his age will be twice the age of his son. The
present age of his son is

Option A: 20 years

Option B: 21 years

Option C: 22 years

Option D: 24 years

Option E: 26 years
[EX A]:
Option C