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Log and some string

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There is a log 18 feet long, the diameter of the extremities being 1 ft and 2.6 ft respectively. This log is wound spirally with a string 75 ft long, the coils being 2.5 ft apart. How many times does the string go around the log?

Japan, 1660

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"Log and some string," Loci (June 2007)

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