Answer: 6 inches
Step-by-step explanation: the area of a rectangle is width times length, that is [tex]A = w.l[/tex]
In this case we have:
So to get the Lenght l we need to divide [tex]l = \frac{A}{w}[/tex]
[tex]l = \frac{72}{12}[/tex]
[tex]l = 6[/tex]