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 :	Choose the correct choice from the following answers: A) 10 m B) 12.5 m C) 17.5 m D) 21.25 m E) None of these
Solution   14.8   Let the height of the building be x meters.   Less lengthy shadow,Less is the height(Direct Proportion)   ∴ 40.25 : 28.75 : : 17.5 : x ⇔ 40.25 × x = 28.75 × 17.5   ⇔ x =(28.75x17.50)/ 40.25 ⇔ x = 12.5, Answer 12.5 m
<result>B</result>
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 :