What is the volume in gallons of a rectangle 118" by 60" by 6"

Answer 1

Since the measures are in feet and inches, I assume you're working with US gallons.
1 cubic foot = 7.48051948 US gallons (approx.)

Volume of container
= (118/12)*(60/12)*(6/12)
= 24.583 cubic ft
= 24.583*7.48051948 US gallons
= 183.9 US gallons (approx.)