Three men wish to buy a horse but none have a sufficient amount of money for the purchase; to do so they must borrow from each other: the first asks for 1/2 of the second's bezants and 1/3 of the third's; the second asks for 1/4 of the third's bezants and 1/5 of the first's; and the third asks for 1/6 of the first's and 1/7 of the second's. How much money does each man have and what is the price of the horse? (Fibonacci, Liber Abaci, 1202)
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The answer is: The men have: 30 b; 59 29/51 b; 69 21/51 b
Horse price: 82 47/51 b
"How much to buy a Horse?," Loci (December 2004)