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Investing in Apples and Pears

Author(s): 
A merchant woman buys 7 apples for 1 denaro, and she sells 6 for 1 denaro, and she buys 8 pears for 1 denaro, and sells 9 for 1 denaro, and she invest 10 denaro and makes a profit of 1 denaro. How much did she invest in apples; how much in pears? (Fibonacci, Liber Abaci, 1202) Click here to reveal the answer

"Investing in Apples and Pears," Loci (March 2005)

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