Sam has a collection of toy cars. his favorites are the 27 red ones which make up 60% of his collection. how many toy cars does sam have?

Well, if 27 cars make up 60% of his entire collection, so you'd want to change 60% into a decimal, which would make it .6. Then, you'd want to divide .6 by 27. You should hopefully get 45 as your answer. 
Hopefully that helped! :)