A class of 99 students were surveyed and asked if they ever had rabbit or dogs for pet at home. 60 students said they had a rabbit and 50 students said that they had a dog. 9 students said that they had never a dog or a rabbit. Then, find the ratio between the students who had only a rabbit and the students who had only a dog?
1
4: 3
2
3: 2
3
5: 4
4
4: 7
5
None of these