Planning & EstimatingCâu 599 / 700
A base rock pad is 36 ft by 50 ft, placed 4 inches thick. If compacted base rock weighs about 1.35 tons per cubic yard, APPROXIMATELY how many tons are needed?
a.22 tons
b.45 tons
c.30 tons
d.60 tons
Giải thích
Area = 36 x 50 = 1,800 sq ft. Thickness 4 in = 0.333 ft, so volume = 1,800 x 0.333 = 600 cubic feet. Divide by 27: 600 / 27 = 22.2 cubic yards. Multiply by 1.35 tons/cy: 22.2 x 1.35 = 30 tons (c). Option (a) leaves cubic yards without converting to tons. Option (b) uses a 6-inch thickness. Option (d) doubles the correct value.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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