Answer:
about 1672 gallons
Explanation:
Assuming by 10ft thick this means the container will be 10 ft tall, split the base into 2 rectangles. (We'll call them A and B).
For rectangle A: Find the volume (V).
V = (l*w*h) = (50*22*10) = 1,100 cubic feet
For rectangle B:
V = (30*38*10) = 11,400 cubic feet
So the total volume of your container will be 1,100 + 11,400 = 12,500 cubic feet
Now since 1 cubic foot of oil = 7.48 gallons,
we'll divide 12,500/7.48 = 1671.12 gallons which can be rounded to 1672