2, there is a small peach seller: 1 dime a peach, 3 peach stones can be exchanged for 1 peach; You only have 1 yuan. How many peaches can you eat at most?
3. There are three pairs of tigers crossing the river: Aa, Bb, CC; Only ABC and A can row a boat, and only one boat can carry two tigers at a time, but each tiger: A, B and C will be eaten by other big tigers without the protection of the corresponding big tigers. Little tigers don't eat little tigers, and big tigers don't eat big tigers, so design a crossing plan to let these three tigers cross the river safely ... Answer: 1, incense A lights up one end and incense B lights up both ends. By the time incense B burned out, it was already 30 minutes. Then ignite the other end of incense A, and the time from this time to burning A is 15 minutes. 2. You can eat at most 15 peaches: one yuan for 10 peaches, three peaches with nine peach stones, and 1 peach with three peach stones, and finally there are two peach stones left. Borrow a peach pit from a vendor and return it to him after eating. 3.A takes B across the river and A comes back by boat. A takes C across the river and A comes back by boat; BC rowed across the river and Bb rowed back; Aa rowed across the river and Cc rowed back; BC rowed across the river and let a row come back; A takes B across the river and A comes back by boat; A takes C across the river. Mission accomplished. ...