Answer: 8
Step-by-step explanation:
Factorise 16 : 4 x 4 x 2 x 2 x 2 x 2
Factorise 20 : 5 x 4 x 2 x 2
The GCF is the greatest common factor.
Since the GCF of the numbers 16 and 20 is 4 x 2 = 8.
So, the greatest number of flower boxes Luis can plant using all the bellflowers and roses are 8.
I really hope this is correct, sorry if it's incorrect!