Answer:
I think the answer would be the 9 pack.
Step-by-step explanation:
Think, if you divide each of the packs by their price the 9 pack is cheaper for one roll.
T=(10)2+-5
T=20+-5
T=20-5
T=15
12* 1/2 is 6. It is 6 because just like 6 times 2 is 12 1/2 times two is 12 it is really the same pretty much.