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 toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently use the bridge may instead purchase a sticker each month for $13 and then pay only $0.10 each crossing during that month. If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?

Option A: 12

Option B: 15

Option C: 16

Option D: 28

Option E: 29
[EX A]: Option A

[EX Q]: Question: The length and breadth of a rectangular floor are 16.25 metre and 12.75 metre respectively. Find how many minimum number of square tiles would be required to cover it completely?

Option A: 375

Option B: 2570

Option C: 2800

Option D: 3315

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

[EX Q]: Question: Pipes A and B can fill a tank in 6 and 4 hours. Pipe C can empty it in 12 hours. If all pipes are opened together, then the tank will be filled in?

Option A: 3hr

Option B: 2hr

Option C: 1hr

Option D: 9/7hr

Option E: 5/3hr
[EX A]:
Option A