Daily Practice – 03/26

Abby and Ben just became friends with Cathy and they want to know Cathy’s birthday.

Cathy gives them a list of 10 possible dates:

May 15     May 16     May 19           June 17        June 18

July 14      July 16      August 14     August 15     August 17

Cathy then tells Abby and Ben separately the month and the day of her birthday respectively.

Abby: I don’t know when Cathy’s birthday is;  but I know that Ben does not know either.

Ben: At first I don’t know when Cathy’s birthday is; but I know now.

Abby: Then I also know when is Cathy’s birthday.

So, when exactly is Cathy’s birthday?

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