Question

A full waterbed mattress is 7 ft by 4 ft by 1 ft. If water weighs 62.4 lb/ft3, what is the weight of the water in the mattress to the nearest pound?
How can you determine the amount of water the mattress can hold?

The weight of the water is in pounds per cubic feet. How can you get an answer with a unit of pounds?,

Answer 1

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