instruction:
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.
question:
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
answer:
Option A


question:
Question: Which of the following is greatest?

 Option A: 1/10

 Option B: 1/100

 Option C: 1/1000

 Option D: 1/10^9

 Option E: 1/5
answer:
Option E


question:
Question: A man goes 10 km against the current of the stream in 5 hr and goes 5 km along the stream in 1hour. How long will it take to go 5 km in stationary water?

 Option A: 1hr 30min

 Option B: 1hr 12min

 Option C: 2hr

 Option D: 2hr 15min

 Option E: 3hr
answer:

Option B