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Investing in Apples and Pears
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 invests 10 denaro and makes a profit of 1 denaro. How much did she invest in apples; how much in pears?
Liber Abaci, Leonardo of Pisa,1202
Click here to reveal the answer
The answer is: she invests \(2\dfrac{2}{5}\) denaro in pears and \(7\dfrac{3}{5}\) denaro in apples
"Investing in Apples and Pears," Convergence (March 2005)
