You measure the shadow cast by a certain tall building and find it to be 85 feet long. Then you measure the shadow cast by a three-foot post and find it to be 4 inches long. Determine the building's height
The post shadow to the post was scaled down by a factor of 9. Hence, we can scale up the shadow of the building by a factor of 9, THUS 85 FT show becomes 85x9= 765 Ft