Planning & EstimatingQuestion 535 of 700
A gravel base 40 ft by 60 ft is placed 6 inches thick. If compacted gravel weighs about 100 pounds per cubic foot, approximately how many tons are required?
a.30 tons
b.60 tons
c.45 tons
d.90 tons
Explanation
Volume = 40 x 60 x 0.5 ft (6 in) = 1,200 cubic feet. Weight = 1,200 x 100 = 120,000 pounds. Tons = 120,000 / 2,000 = 60 tons. Option a uses the wrong thickness or halves the result. Options c and d misapply the density. Convert depth to feet, find cubic feet, multiply by density, then divide by 2,000 pounds per ton.
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