Question

Ravi is standing 25ft away from a street light that is 20 ft tall How tall is he ,if his shadow is 5 ft long

Answer 1

Triangles ABD and CDE are similar and CE is the height of the ravi CD is the length of the shadow  AB is the tower since triangle are similar 
therefore AB/AD/CE/CD
⇒20/25=CE/5
⇒CE=4ft=height of ravi