Quandaries
and Queries 

Who is asking: Parent Level: Secondary Question: Each 1ft represents how many gallons of fluid? Cylinder A=? Cylinder B=? 

Hi Dean, I'll do cylinder A and that should show you how to do the calculations for B. I am going to assume that you mean American gallons. One American gallon is 231 cubic inches. The volume of a cylinder is given by
Your cylinder A has a radius of 4' = 48" so, since is approximately 3.1416, one foot (12 inches) height of this cylinder has a volume of
Since 231 cubic inches is one gallon this is
Since your cylinder is 12 feet high its volume is
Penny 

