Framing & StructuralCâu 396 / 700
A stair must rise a total of 108 inches from finished floor to finished floor. If each riser is designed at 7.2 inches, how many risers are required?
a.12 risers
b.14 risers
c.15 risers
d.18 risers
Giải thích
Number of risers equals total rise divided by riser height: 108 / 7.2 = 15 risers exactly. 12 risers would give a 9-inch riser (too tall); 14 risers gives about 7.7 inches (acceptable but not the designed 7.2); 18 risers gives only 6 inches, more than designed.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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