Book Maths Puzzle

A man has some hens and some cows.If the number of heads be 48 and the number of feet equals 140,the number of hens will be?

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Book Other Question

Which is the only maths term which has
6(six) 'i' in it
Think!
A two digit number is obtained by multiplying the sum of the digits by 8 and adding 1 or by multiplying the difference of the digits by 13 and adding 2