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Interesting math story 62 ... Equivalent substitution
Everyone knows the story "Cao Chong is called an elephant", right? Cao Chong didn't call the elephant casually, but used the method of "equivalent substitution": two exactly equal quantities can be substituted for each other. This method is often used to solve mathematical problems.

Please use the method of "equivalent replacement" to calculate: 1 pig can be exchanged for 4 sheep and 2 sheep for 6 rabbits, so how many rabbits can 5 pigs be exchanged?

Answer: 2 sheep = 6 rabbits, so 1 sheep = 3 rabbits, so 4 sheep can be exchanged for 4×3 = 12 rabbits, so 1 pig can be exchanged for 12 rabbits, and 5 pigs can be exchanged for12× 2 rabbits.