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?
Answer & explanation
Correct answer: option 3
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