1. 5 to 20 ---> c. 20 to 80
(5/20 and 20/80, both have the same answer(ratio) which is equal to 1/4)
2. 5 to 40 ---> e. 11 to 88
(5/40 and 11/88, both have the same answer(ratio) which is equal to 1/8)
3. 9 to 45 ---> b. 7 to 35
(9/45 and 7/35, both have the same answer(ratio) which is equal to 1/5)
4. 2 to 20 ---> a. 1 to 10
(2/20 and 1/10, both have the same answer(ratio) which is equal to 1/10)
5. 4 to 12 ---> d. 10 to 30
(4/12 and 10/30, both have the same answer(ratio) which is equal to 1/3)