A semisubmersible displacing 700,000 cubic feet while floating in sea water (64 pounds per cubic foot) weighs __________.

Correct Answer: Option C — 20,000 long tons

Displacement in long tons is calculated by multiplying volume by water density and dividing by 2240 pounds per long ton. Thus, 700,000 cubic feet multiplied by 64 pounds per cubic foot equals 44,800,000 pounds, which divided by 2240 yields exactly 20,000 long tons.