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.
Let x be the number of circular coins, y be the number of square coins, and z be the number of triangular coins.
Thus:
x*(15/11) + y*(16/11) + z*(17/11) = 11.
Multiplying by 11:
15x + 16y + 17z = 121.
Here we have to use trial and error method. I divided 121 by 15 to get 8 plus a remainder of 1. It is then obvious that x=7, y=1, and z=0 would solve the equation.
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