Planning & EstimatingQuestion 585 of 700
A concrete curb is 6 inches wide, 18 inches high, and 90 ft long. How many cubic yards of concrete are needed?
a.2.5 cubic yards
b.67.5 cubic yards
c.5.0 cubic yards
d.1.25 cubic yards
Explanation
Convert to feet: width 6/12 = 0.5 ft, height 18/12 = 1.5 ft. Volume = 0.5 x 1.5 x 90 = 67.5 cubic feet. Divide by 27: 67.5 / 27 = 2.5 cubic yards (a). Option (b) leaves cubic feet without dividing by 27. Option (c) uses a 12-inch width. Option (d) uses only a 9-inch height.
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