Question

A general contractor is constructing a building that requires a concrete foundation that is to be 35 feet by 12 feet and 3 inches thick. If the local home supply store sells concrete for $ 125 per cubic yard, what will be the cost of the concrete for the foundation?

Answer 1

First we need to calculate the volume which is Base*depth or length*width*depth
first we have to change all the units so they are the same, 3 inches in this case will equal 1/4feet
multiply all the numbers together
35ft*12ft*1/4foot= 105 cubic feet
however the problem says the cost per cubic *yards*
so take the 105 cubic feet and divide by 3 (3 feet to a yard)
105/3 = 35 cubic yards
the cost of 35 cubic yards of concrete =
35*125= $4375