Wow, fairly simple although it seems hard. :D
ou need to get it over 100 for easy change to a decimal.
7/20 is equal to 35/100.
You multiplied the 20 by 5 to get 100
You need to multiply the 7 by 5 to get 35
You get 35/100
Any number over 1 is itself.
Divide 100 by 100 to get 1
Divide 35 by 100 (You can do that right) to get 0.35
=0.35