Discussion :: Chain Rule
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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:
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Answer : Option B
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=\( \frac { 28.5*17.5 } { 40.25 } \)
x = 12.5
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