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Pigs and Ducks

While driving through the countryside one day I saw a farmer tending his pigs and ducks in his yard. I was curious to know how many of each he had. I stopped the car and inquired. Leaning on the stile jovially, he replied. They have altogether 60 eyes and 86 feet between them. I drove off calculating in my mind exact ducks and pigs he had. What do you think is the answer?

SOLUTION : Let number of pigs be m and number of ducks be n. The number of eyes will be 2m + 2n = 60. The number of legs will 4m + 2n = 86. Solving these two equations we get m = 13 and n = 17. So, number of pigs is 13 and number of pigs is 17.

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