There are 20 heads and 54 legs in the same cage. How many chickens and rabbits are there?
Suppose all chickens are chickens, then rabbits have: (54-20 × 2) / (4-2) = 14 / 2 = 7 (chickens), then chickens have: 20-7 = 13 (chickens) answer: there are 13 chickens and 7 rabbits
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