A construction site needs to pour a concrete foundation that is 18 inches thick. If the dimensions of the foundation are 40 feet by 60 feet, how many cubic yards of concrete are required?

The dimensions of the foundation are 40 feet by 60 feet, and it’s 18 inches thick.

First, we need to convert the thickness into feet (12 inches = 1 foot):

\$ (18 "inches")/ (12 "inches per foot")\$ = 1.5 feet

Now, we need to calculate the volume:

Volume = \$"Length" \times "Width" \times "Height"\$

Now substitute the values in the formula:

Volume = \$40 feet \times 60 feet \times 1.5 feet\$

Next, convert the volume to cubic yards (1 cubic yard = 27 cubic feet):

Volume (in cubic yards) = \$(40 feet \times 60 feet \times 1.5 feet) / (27 cubic feet per cubic yard)\$

After multiplication, we get

Volume (in cubic yards) = \$(3600 "cubic feet") / (27 "cubic feet per cubic yard"\$

After division, we get

Volume (in cubic yards) = 133.33 cubic yards

So, approximately 133.33 cubic yards of concrete are required for the foundation.

Answer

C