$$12\times2=24$$  $$8-2=6$$  $$66-24=42$$  $$42\div6=7$$ 
Cici bought $$12$$ pencils and notebooks in total for $$66$$. Each pencil cost $$2$$. Each notebook costs $8$. How many notebooks did Cici buy? 
a) $$5$$ 
b) $$6$$ 
c) $$7$$ 
d) $8$ 
e) $$10$$ 