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?
- 10 m
- 17.5 m
- 12.5 m
- 21.25 m
Explanation
Let the height of the building be x meters.
Less lengthy shadow, Less in the height (Direct Proportion)
∴ 40.25 : 28.75 :: 17.5 : x ⇔ 40.25 × x = 28.75 × 17.5
x = 28.75 × 17.5/ 40.25 ⇒ x = 12.5
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