Answer:
They could form 9 groups.
Step-by-step explanation:
The factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126
The factors of 135 are: 1, 3, 5, 9, 15, 27, 45, 135
The GCF (Greatest Common Factor) of 126 & 135 is 9.
You can use Prime Factorization to find the GCF.
126 = 2 x 3 x 9
135 = 3 x 5 x 9
I hope this helps!