Hey there! :)
Area = length · width
The length MUST be 2x the width
Possible Combinations:
1 by 72 x
2 by 36 x
3 by 24 x
4 by 18 x
6 by 12 ✔
8 by 9 x
The only combination where the length is 2x the width is: 6 by 12
Width: 6
Length: 12
12 × 6 = 72
Hope this helps :)