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logic puzzles and riddles,
puzzling riddles,

science puzzles
and
math puzzles and riddles.

Answers and detailed solutions are included.

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# Keep the money rolling - math puzzle of the day

You put two 1 dollar coins on a table, such that they touch each other (see the figure). While you fix the lower coin with your finger, you will turn the upper around it (without slipping). Somewhat later the moving coin will be back in his original position. How many rotations on his midpoint did the moving coin make? |

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