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Mathematical problems of cats
The life span of cats is shorter than that of dogs 12 years, and that of dogs is 2 1 year shorter than that of cats.

Answer: Then let the cat live in X and the dog live in Y.

①y=3X- 12

②X=2y-2 1

Bring ① into ② to get X=2(3X- 12)-2 1, that is, X=6X-45 to get X=9.

y = 3X- 12 = 27- 12 = 15

To sum up, cats 15 years old and dogs are 9 years old.

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