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Looking for Bargains
One says that 10 garments were purchased by two men at a price of 72 dirhams. The garments varied in value. The price of each garment of one man is 3 dirhams more than the price for each garment of the other. How many garments did each man buy?
Kitab fi al-jabr wa al-muqabala (Book of Algebra), Abu Kamil, c. 900
Click here to reveal the answer
The answer is: one man bought 6 garments for 6 dirhams each, the other bought 4 garments for 9 dirhams each
"Looking for Bargains," Convergence (April 2004)
