Hen and a Half

If a hen and a half lay an egg and a half in a day and a half, how long will it take ten hens to lay ten eggs?


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Ah, this famous old chestnut.

  hens eggs days  
   
So 3 3 Double the hens and we double the eggs. So each hen lays one egg every 1½ days.
Therefore, 10 10

So the answer is 1½ days.

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