Answer: There are 42 products he can have at maximum.
Step-by-step explanation:
Since we have given that
Number of products displays = 12
Number of shelves six products have = 4
Number of shelves six products have = 3
So, total number of shelves first six products have
[tex]6\times 4=24[/tex]
Total number of shelves next six products have
[tex]6\times 3\\\\=18[/tex]
So, the maximum number of products that he can have is given by
[tex]24+18=42[/tex]
Hence, there are 42 products he can have at maximum.