Here's how to calculate the volume of a 48x12x12 container and convert it to gallons:

1. Calculate the volume in cubic inches:

* Volume = Length x Width x Height

* Volume = 48 inches x 12 inches x 12 inches

* Volume = 6,912 cubic inches

2. Convert cubic inches to gallons:

* There are 231 cubic inches in one gallon.

* Volume in gallons = 6,912 cubic inches / 231 cubic inches/gallon

* Volume in gallons ≈ 29.92 gallons

Therefore, a 48x12x12 container holds approximately 29.92 gallons.