Source: Bright Side
American academic Raymond M. Smullyan was famous not only for his math research but also for the multitude of books he wrote full of paradoxes and riddles.
Bright Side chose several amusing tasks that not everyone will be able to solve. There’s a step-by-step explanation at the end of the article.
A strange verdict
And now for some slightly more difficult riddles.
How much are the birds?
A bear’s fur
Based on materials from Raymond Merrill Smullyan