One type of lubricating oil weighs approximately 52 pounds per cubic foot, or 7 pounds per gallon. A 42-gallon barrel will hold approximately how many cubic feet of such oil?

Answer 1

Ugghh, time to go metric.

42 gallons weigh 7(42) or 294 pounds

each cubic foot weighs 52 pounds
so the number of cubic feet = 294/52 = 5.654 ft^3