Question 325078
If 1.5 chickens lay 1.5 eggs in 1.5 days,
--> 1.5 eggs/2.25 chicken-days
= 2/3 eggs per chicken per day.
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 how many eggs do 9 chickens lay in 15 days?
(2/3)*9*15= 90 eggs
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The usual question, given the egg-laying rate of the chickens, is
"...how much does a pound of butter weigh?"