A man wishes to sell a puppy for $11. A customer wants to buy it but only has foreign currency. The exchange rate for the foreign currency is 11 round coins = $15, 11 square coins = $16, 11 triangular coins = $17.

How many of each coinage should the customer pay?

7 round coins (worth $15/11 each) + 1 square coin (worth $16/11 each) should do it...

7 x (15/11) = 105/11
1 x (16/11) = 16/11

together: 105/11 + 16/11 = 121/11 = $11

Posted by SilverKnight on 2003-10-31 12:56:50