Question

Brian is 6 feet tall and casts a 4 foot shadow. At the same time, a nearby flag pole casts a 20 foot shadow.

How tall is the flag pole?

Answer 1

since brians shadow is 2/3rds his height

4 / 6 is 2 /3

20 / 30 is 2 / 3 too so flag pole must be 30 feet tall