Puzzle answer :
Alex, Bob and Carl go for a walk every day.
If Alex doesn’t wear a hat, then Bob wears a hat.
If Bob doesn’t wear a hat, then Carl wears a hat.
Today Bob is not wearing a hat.
Who is wearing a hat?
Answer: Both Alex and Carl are wearing hats.
As per given information we understand that, Bob is not wearing a Hat, Carl is wearing a hat.
Now if Alex doesn’t wear a Hat, than Bob must wear a Hat.
But he is not wearing a Hat. So it implies Alex is also wearing a Hat.
So Alex and Carl are wearing hats.
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