10. A heard of 2 legged and 4 legge...
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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

11th - 12th Class
Maths
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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 ]
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