SOLUTION: Three chickens in three days laid three eggs. How many eggs will be laid by six chickens in six days.

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i guess we have the following approach:

3 chickens in 3 days lay 3 eggs, so
1 chicken in 3 days lays 1 egg
1 chicken in 1 day lays 1/3 egg.

So,
6 chickens in 1 day lay 6(1/3) --> 2 eggs
6 chickens in 6 days lay 6*2 --> 12 eggs.

jon