So if there are 18 paintings and 4 photographs, then they need to be divided evenly into equal groups/rows.
18÷2=9
4÷2=2
A. 2 rows can be possible with 9 paintings and 2 photographs in each row.
B. 3 rows are not possible because none of the numbers can be divided by three.
C. 4 rows cannot be possible. While 4 can be divided by 4, 18 cannot.
D. 6 rows cannot be possible because the only number that can be divided by 6 is 18, which would be three. 4 is not divisible by 6.
You were right, the answer is A. with each row containing 9 paintings and 2 photographs!
*If you have any questions or concerns, please feel free to ask me. I'll be happy to help!