In the Delhi zoo, there are some ducks and rabbits. If the heads are counted there are 160, while the legs are 450. What will be number of ducks in the zoo?

95

Assume number of rabbits be "r"

Assume number of ducks be "d"

Number of heads = r+d = 160

Number of legs = 4r + 2d = 450

⇒4r+2d - 2r -2d = 130

2r = 130

r = 65

d = 95 

The correct answer is Option (3) → 95