A flagstaff 17.5 m high casts a shadow of 40.25 m. The height of the building which casts a shadow of 28.75 m under similar conditions will be:

🧠 Explanation (Math):

Given: Flagstaff 17.5 m casts 40.25 m shadow; building casts 28.75 m (same conditions)
Step 1: Similar triangles ⇒ height/shadow is constant
Step 2: Building height = 17.5 × (28.75 / 40.25) = 12.5 m
Final Answer: 12.5 m