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Chain Rule - General Aptitude

Q1:

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:

A 10 m

B 12.5 m

C 17.5 m

D 21.25 m

ANS:B - 12.5 m

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