# volume of a rectangular slab

The volume of a rectangle slab of concrete needs to exceed 72 cu ft. If the length is 12 ft and the width is 8 ft> How do I come up with how thick the slab needs to be? I know that in order to find the answer I need the formula V=l*w*h. So I put in 72cu ft = 12ft*8ft*h. Is this the correct way to solve for this problem?

### Comments for volume of a rectangular slab

 Feb 06, 2011 Volume of a Rectangular Slab by: Staff The question: The volume of a rectangle slab of concrete needs to exceed 72 cu ft. If the length is 12 ft and the width is 8 ft> How do I come up with how thick the slab needs to be? I know that in order to find the answer I need the formula V=l*w*h. So I put in 72cu ft = 12ft*8ft*h. Is this the correct way to solve for this problem? The answer: Yes. You are solving the problem correctly. 72cu ft = 12ft*8ft*h. Solve for h h = ¾ foot The final answer is: the thickness of the slab must be greater than ¾ ft (greater than 9 inches) Thanks for writing. Staff www.solving-math-problems.com