The quotient of a to the twentieth power and a to the tenth power

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Can anyone me with 32,33,36,37,and 40.

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?