If height of the first storey of a building is 3.2 m and riser is 13 cm, the number of treads required, is
A. 12
B. 18
C. 24
D. 25
Answer: Option C
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Riser=320/13 =24.6 we take 25 than tread is 25-1 is 24
3.2 .13 =24.61 means 25 rise and - 1 = 24 tread
3.20/0.13 = 25 (Height of a building/ riser).
For each storey, No of threads = 25 - No of storeys (Here it is 1).
i.e 25-1 = 24.