Solution to: Charlie's Chickens

1 chicken lays 2 eggs in 3 days, so 3 chickens lay 3 × 2 = 6 eggs in 3 days. In 9 days, these 3 chickens lay 3 times as much eggs as in 3 days. Conclusion: three chickens lay 3 × 6 = 18 eggs in nine days.

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