Planning & EstimatingQuestion 583 of 700
A concrete stem wall is 10 inches thick, 3 ft tall, and 80 ft long. How many cubic yards of concrete are required?
a.200 cubic yards
b.8.9 cubic yards
c.7.4 cubic yards
d.3.7 cubic yards
Explanation
Convert thickness to feet: 10 / 12 = 0.8333 ft. Volume = 0.8333 x 3 x 80 = 200 cubic feet. Divide by 27: 200 / 27 = 7.41, about 7.4 cubic yards (c). Option (a) leaves cubic feet without dividing by 27. Option (b) rounds the thickness up to a full 12 inches (1 ft). Option (d) uses only half the wall length.
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