Question

In a group of cows and ducks, the number of legs are 24 more than twice the number of heads. What is the number of Cows in the group?

Answer 1

LET THE NUMBER OF HEADS BE 'X'
THEREFORE, 2X=X+24
2X-X=24
X=24
NO OF LEGS=24+24
                     =48
SINCE COWS HAVE FOUR LEGS
NO.OF COWS = 48/4=12

Answer 2

No. of ducks be y and cows be x
We have  no of heads = x+y
                   no of legs = 2y+4x
ATQ      2y + 4x = 2(x+y) + 24
          ⇒ 2x = 24 ⇒ x=12
Now of cows were 12.