Enigma 361: How many furlongs to the mile?
9 September 2016
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From New Scientist #1510, 29th May 1986 [link]
“How can one inch, one foot, one yard, one furlong and one mile be only 249 inches?” asked Albert, who was looking at a calculation in the Tarizania University library.
“Simple,” replied the librarian. “That sum was done before we adopted the English system of metrication.”
“How many furlongs to the mile were there?”
“Perhaps you would like to work out that prime number if I tell you that there were more furlongs to the mile than yards to the furlong, more yards to the furlong than feet to the yard and more feet to the yard than inches to the foot,” said the librarian.
What is the answer to Albert’s question?