Question

10. (2) Average legs ( =frac{320}{100}=3.20 )
( therefore ) Ratio of animals ( =2: 3 )
Hence, number of 2 legged animals
[
=frac{2}{2+3} times 100=frac{2 times 100}{5}=40
]

# 10. A heard of 2 legged and 4 legged animals give a head count as 100. When legs are counted, it comes to be 320. The number of 2 legged animals is (a) 30 (b) 40 (c) 60 (d) 80

Solution