1. Burn a non-uniform rope, which takes an hour from the head to the tail. Now there are several ropes as the same material, ask how to use the ro turns to time a 10th minute fifteen minutes? 2. If you have an infinite water, a 3 liter of rack, a 5 liter, the shape is uneven, ask how can you accurately call 4 liters of water? 3. One forces lead to honesty and lie. Two people have been known, known as honesty, the other is to talk about the lie. Honest is always truth forever, and the lies will always talk forever. Now you have to talk to the country, but I don't know which path you should go, you need to ask these two people. What should I ask?
(Supplemental conditions: A total of only a question. For example, if you ask a question, you can't ask again. Of course, you can't ask B.)
4. Posted 10 straight lines in 9 points, requires at least three points on each straight line? 5. You let the workers work for 7 days for you, the return is a gold bars, this gold bars are divided into seven sections, you must give them a gold bars at the end of each day. If you only allow you to break the gold bars twice, how do you pay for your workers?
