A concrete slab is 30 ft x 40 ft x 4 inches thick. How many cubic yards of concrete are needed? (1 cubic yard = 27 cubic feet)
a.44.4 cubic yards
b.12.3 cubic yards
c.48 cubic yards
d.14.8 cubic yards
Giải thích
Volume in cubic feet = 30 x 40 x (4/12) = 30 x 40 x 0.333 = 400 cubic feet. Convert to cubic yards: 400 / 27 = 14.8 cubic yards.
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Người kiểm duyệt Abraham Chen — Licensed California General Contractor (CSLB License #1101856 — kiểm tra)