Practice | Hashtable

Home > Practice > Arithmetic Aptitude > Chain Rule > Miscellaneous

1. A flagstaff 17.5 m high caste 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

Solution:

Let the height of the building be x metres
Lees lengthy shadow, Less is the height (Direct proportion)

\begin{aligned} ∴ 40.25 : 28.75 :: 17.5 : x \\ \Leftrightarrow 40.25 \times x = 28.75 \times 17.5 \\ \Leftrightarrow x = \frac{(28.75 \times 17.5)}{40.25} \\ \Leftrightarrow x = 12.5 \end{aligned}

You must login to add comments. Login now.