Try puzzles from Lateral Logic Puzzles.

Red Or Green?

You are given four pieces of cardboard and told that each one is either red or green on one side, and that each one has either a circle or a square on the other side. They appear on the table as follows:

Which ones must you pick up and turn over in order to have sufficient information to answer the question: Does every red one have a square on its other side?

A Logic Riddle

In olden days, the student of logic was given this problem:

If half of 5 were 3, what would one-third of 10 be?

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