Answer :
The waterbed is 7 x 4 x 1 ft, which is equal to 28 cubic ft (ft3).
The weight is (62.4 lb) per (1 cubic foot). Since the total volume is 28 cubic feet, you multiply 62.4 pounds x 28 ft3.
62.4 x 28 = 1747.2 lbs
The total weight is 1747.2 lbs