Paul has $$(36 + 4) \div 2 = 20$$ toy cars. 
Peter has some toy cars, and Paul has $$4$$ more toy cars than Peter. Altogether they have $$36$$ toy cars. How many toy cars does Paul have? 

(a) $$16$$ 
(b) $$48$$ 
(c) $$20$$ 
(d) $$12$$ 