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 man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:

Option A: 2 km/hr

Option B: 1 km/hr

Option C: 4 km/hr

Option D: 6 km/hr

Option E: 5 km/hr
[EX A]: Option B

[EX Q]: Question: The functions f and g are defined for all the positive integers n by the following rule: f(n) is the number of perfect squares less than n and g(n) is the number of primes numbers less than n. If f(x) + g(x) = 16, then x is in the range:

Option A: 30 < x < 36

Option B: 30 < x < 37

Option C: 31 < x < 37

Option D: 31 < x < 38

Option E: 32 < x < 38
[EX A]: Option C

[EX Q]: Question: Ginger over the course of an average work-week wanted to see how much she spent on lunch daily. On Monday and Thursday, she spent $5.43 total. On Tuesday and Wednesday, she spent $3.54 on each day. On Friday, she spent $4.89 on lunch. What was her average daily cost?

Option A: a. $3.19

Option B: b. $3.75

Option C: c. $3.48

Option D: d. $4.08

Option E: e. $4.23
[EX A]:
Option C