Sum of tread and rise must lie between
A. 300 to 350 mm
B. 400 to 450 mm
C. 500 to 550 mm
D. 600 to 650 mm
Answer: Option B
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Min depth of riser = 150mm
Min Width of Tread = 250 mm
Sum = 400
and similarly for max depth and width.
therefore B is correct
Ye kesa explain anyone