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A bag of chicken feed can feed 18 chickens for 54 days. For how many days will it feed 12 chickens?

A bag of chicken feed can feed 18 chickens for 54 days. For how many days will it feed 12 chickens? Correct Answer 81

18 chickens can feed for = 54 days1 chicken can feed for = (54*18) days12 chickens can feed for = (54*18)/12  days                                              = 81 days

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II: Some Hens are birds.
III: Some chickens are not hens.