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In a group of boys and dogs, the number ...

In a group of boys and dogs, the number of heads is 7 and number of legs is 20. How many boys and dogs are there re- spectively?

A

2 boys and 5 dogs

B

3 boys and 4 dogs

C

4 boys and 3 dogs

D

5 boys and 2 dogs

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The correct Answer is:
C
Number of heads
`=B+D=7" "…….(i)`
Number of legs =2B+4D=20
or `B+2D=10" "......(ii)`
From statements (i) and (ii) B=4 and D=3
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