A street sign casts a 12-foot 9-foot shadow. The lamppost next to it cast a 24-foot shadow. How tall is the lamppost?
The lamp post is
12' street sign casts a shadow of 9'.
To find the height of the lamp post, with its shadow 24'
Since both the shadows are 9 : 24, the heights will be in x : 12, where x is the height of the lamp post.