Core TradesQuestion 170 of 700
A continuous foundation footing is 18 inches wide, 10 inches deep, and 90 feet long. Approximately how many cubic yards of concrete does it contain?
a.2.8 cubic yards
b.3.5 cubic yards
c.4.2 cubic yards
d.12.5 cubic yards
Explanation
Convert to feet: 1.5 ft x 0.833 ft x 90 ft = 112.5 cubic feet; 112.5 / 27 = about 4.2 cubic yards. The lower figures understate the cross-section, and 12.5 results from leaving dimensions in inches or failing to divide by 27.
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