A man has some hens and some cows. If the total number of heads of hens and cows together is 50 and the nunber of feet of hens and cows together is 142, then the number of cows is
Let cows be x and hen be yÂ
we get x+y =50
4x+2y =142
solving we get x=21 and y=29
so cows =21
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