Question 9
The beaver wants a pine tree and a bundle of grass to build a house, but has only two carrots. Luckily, there is a market at Grandson Castle today. The following trades are available in its rooms:
- Room A: exchange a carrot for a fish, or a coin for grass.
- Room B: exchange a fish for a bowl of rice, or a ring for ice cream.
- Room C: exchange ice cream for a coin, or a ring for grass.
- Room D: exchange a carrot for a bowl of rice, or a carrot for ice cream.
- Room E: exchange a carrot for a coin, or a ring for a pine tree.
- Room F: exchange a ring for a coin, or ice cream for a fish.
- Room G: exchange ice cream for a ring, or a carrot for grass.
- Room H: exchange a carrot for grass, or a bowl of rice for a fish.
What is the minimum number of rooms the beaver must enter to obtain a pine tree and a bundle of grass to take home for building?
- Room A: exchange a carrot for a fish, or a coin for grass.
- Room B: exchange a fish for a bowl of rice, or a ring for ice cream.
- Room C: exchange ice cream for a coin, or a ring for grass.
- Room D: exchange a carrot for a bowl of rice, or a carrot for ice cream.
- Room E: exchange a carrot for a coin, or a ring for a pine tree.
- Room F: exchange a ring for a coin, or ice cream for a fish.
- Room G: exchange ice cream for a ring, or a carrot for grass.
- Room H: exchange a carrot for grass, or a bowl of rice for a fish.
What is the minimum number of rooms the beaver must enter to obtain a pine tree and a bundle of grass to take home for building?