Answer: There are 5 identical groups with the same numbers of representatives and senators that can be formed.
There are 87 representatives in each group and 20 senators in each group.
Explanation:
Since we have given that
Number of representatives = 435
Number of senators serving in the United States Congress = 100
Now, we need to find the number of identical groups with the same numbers of representatives and senators that can be formed from all of Congress if we want to form largest group,
For largest group, we'll do H.C.F. of 435 and 100,
So,

So, there are 5 identical groups with the same numbers of representatives and senators that can be formed.
Now, Number of representatives in each group is given by

Number of senators in each group is given by

Hence, there are 87 representatives in each group and 20 senators in each group.