Planning & EstimatingCâu 495 / 700
A concrete block wall is 8 ft high and 40 ft long, built with standard 8 in by 16 in nominal units. Using the rule of 1.125 blocks per square foot of wall face, how many blocks are needed (before waste)?
a.360 blocks
b.320 blocks
c.288 blocks
d.400 blocks
Giải thích
Wall face area = 8 x 40 = 320 sq ft. A nominal 8 by 16 in unit covers about 0.89 sq ft, giving roughly 1.125 blocks per square foot. Blocks = 320 x 1.125 = 360. Option b (320) forgets the per-square-foot factor. A waste allowance of about 5 percent would be added on top for breakage and cuts.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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