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Vandaag is het 22 August 2018

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Keep the money rolling - math puzzle

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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? coin

Answer

2 rotations.