Answer:
The answer to your question is 7 groups
Step-by-step explanation:
Data
Total number of dogs = 42
Total number of cats = 35
The Number of groups = ?
Process
1.- Calculate the Greatest common factor (GCF)
42 35 2
21 35 3
7 35 5
7 7 7
1 1
The GCF is 7
2.- Conclusion
Each group will have 42/7 = 6 dogs and 35/7 = 5 cats
And there will be 7 groups in total.