"The concrete slab will be 12 feet 9 inches long, 9 feet 3 inches wide, and 3 inches thick"
Laying out the information
- 12 feet 9 inches is
#(12\cdot12)+9#since each foot is 12 inches. This gets you #144+9=153#inches for your length.
- 9 feet 3 inches is
#(9\cdot12)+3#for the same reason. This gets you #108+3=111#inches for your width.
- Your height (thickness of slab) is
Now find the volume of the slab by using the formula
#l\cdotw\cdoth#, or #153xx111xx3=50949#cubic inches.
But the weight is 150 pounds per cubic foot, so you have to turn the inches into feet. Again, since each foot is 12 inches:
Now to solve for weight, multiply the cubic feet weight by 150 to get your answer.
We will need to find the volume of the slab in cubic feet (
The weight of the slab is then: