Question

At a certain time of day, a ten-foot vertical pole casts a horizontal shadow that is six feet long, and a nearby tree casts an eighteen-foot shadow. how tall is the tree

Answer 1

10 is to x as 6 is to 18 or
10/x=6/18
10/x=⅓
10=⅓x
3(10)=⅓x*3
30=x

the tree is 30 feet tall