What times what equals to 810

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

Q1 how many whole numbers less than 1000 can be written as a product of 3 consecutive whole numbers? a)10 b)11 c)15 d)21 q2 how many whole numbers between 5000 and 6000 consist of four different digits that decrease from left to right? a)3 b)10 c)69 d)120

Hello i need with my math homework i don't understand can someone explain how this works