geometry question help

Question

Shadows were measured at the same time of day to determine the height of a grain silo. If the silo's shadow measured 40 ft and the height of the silo is 140 ft, and a light pole's height is 13 ft, which measurement would be the length of the light pole's shadow?

A. Not possible

B. 21.5 ft long

C. 22.75 ft long

D. 3.7 ft long

E. 1.9 ft long

Answer 1

Then right triangle formed by the silo and its shadow is similar to the right triangle formed by the pole and its shadow. Corresponding sides of similar triangles are in proportion. This "hint" should allow you to solve the problem.