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.
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Question: Question: The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is:

Option A: 3500

Option B: 4000

Option C: 4050

Option D: 5000

Option E: 6000

Answer: Option B

Question: Question: There are 9 executives, including the CEO and CFO, that are asked to form a small team of 5 members. However, the CEO and CFO may not both be assigned to the team. Given this constraint, how many ways are there to form the team?

Option A: 85

Option B: 87

Option C: 89

Option D: 91

Option E: 93

Answer: Option D

Question: Question: If seven machines working at the same rate can do 3/4 of a job in 30 minutes, how many minutes would it take two machines working at the same rate to do 3/5 of the job?

Option A: 45

Option B: 60

Option C: 75

Option D: 84

Option E: 100

Answer:
Option D