Hens and pigs

Hens and pigs have 46 feet in total. At least how much can heads have?

Correct result:

n =  12


46=2s+4p p=46/4=232=11.5  p1=p=11.5=11 s1=(464 p1)/2=(464 11)/2=1  n=s1+p1=1+11=12

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