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A flagstaff 17.5 m high casts a shadow o...

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`

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