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Classic joke collection: There are 15 chickens and 15 rabbits. A chicken has 40 legs. How many chickens and rabbits are there?

Assuming that the chicken and rabbit are well-trained, blow a whistle and lift one foot, 40-15=25. I blew the whistle again and raised one foot again, 25-15=10. At this time, the chicken sat down on the ground, and the rabbit was still standing on its two feet. Therefore, there are 10÷2=5 rabbits and 15-5=10 chickens

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