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93 Horses and 36 cows. ( 3 legs / cow * x cow + 4 legs / horse * y horse = 480 legs and 1 head / cow * x cow + 1 head / horse * y horse = 129 are two equations in two unknowns, which can easily be solved )

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Q: On a farm there are horses and three legged cows there are total of 129 heads and 480 legs how many horses are on the farm?
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