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A farm consists entirely of cows and chickens. Given the number of animal heads and animal legs on the farm, return the number of cows on the farm. numCows(3, 6) → 0 numCows(5, 20) → 5 numCows(2, 6) → 1 ...Save, Compile, Run (ctrl-enter)  | 
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Difficulty: 100 Post-solution available
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