Question

There are several human beings and several dogs in a room. One tenth of the humans have lost a leg. The total number of feet is 77. Then the number of dogs is:

• A. 6
• B. 4
• C. 5
• D. Not determinable due to insufficient data

Answer 1

The correct option is C

5

Let the no. of men = x

No of dogs = y

So, $\frac{x}{10}+\frac{2.\left(9x\right)}{10}+4y=77$

$\frac{19x}{10}+4y=77$

$x=\frac{770-40y}{19}$

For y = 5, x = 30

So, No. of dogs = 5