Lessons

General Aptitude
13.1 Chain Rule - General Questions

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Q.

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:

View Answer

Correct choice: 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 = 28.75 x 17.5
40.25

x = 12.5

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