Aptitude - Chain Rule - Discussion
Discussion Forum : Chain Rule - General Questions (Q.No. 11)
11.
A flagstaff 17.5 m high casts a shadow of length 40.25 m. The height of the building, which casts a shadow of length 28.75 m under similar conditions will be:
Answer: Option
Explanation:
Let the height of the building x metres.
Less lengthy shadow, Less in the height (Direct Proportion)
40.25 : 28.75 :: 17.5 : x 
40.25 x x = 28.75 x 17.5
| x = | 28.75 x 17.5 |
| 40.25 |
x = 12.5
Discussion:
12 comments Page 2 of 2.
Mini said:
1 decade ago
17.5m cast shadow= 40.25
;. 1m cast shadow= 40.25/17.5= 2.3m
so The height of the building, which casts a shadow of length 28.75m= 28.75/2.3= 12.5m
;. 1m cast shadow= 40.25/17.5= 2.3m
so The height of the building, which casts a shadow of length 28.75m= 28.75/2.3= 12.5m
Arnav Gupta said:
2 decades ago
How to simplify calculation for quick solution.Please suggest any method.
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