a pizza is divided into 12 equal slice.
4 slices have mushrooms only.
2 slices have mushrooms and pepperoni.
6 slices have pepperoni only.
write two equivalent fractions to describe the parts of the pizza with 
mushrooms only : ____________ and _________
pepperoni only : ___________ and _________
mushrooms and pepperoni : ____________ and ______________ .