Answer: 25 big dogs
Explanation:
We can rewrite the ratio as small dogs : big dogs : total dogs, or 4:3:7
We then need to find the factor that will get us from 7 to 60, the total number of dogs.
60/7 = 8.57
This factor can be used to find the exact number of the big dogs by multiplying it with the original ratio.
8.57*3 = 25.71
As we cannot have a fraction of a dog, there will be 25 big dogs.