Answer:
10 and 8/10 gallons
Step-by-step explanation:
1 gallon = 10/10 so you have 27/10 for 3 tables.
27 divided by 3 = 9. One table is 9/10 of a gallon
12 times 9 = 108
108 divided by 10 = 10.8 so you need 10 and 8/10 gallons for 12 tables
I'm not that great at explaining so I hope this helps :)