They have $12+9=21$ pieces of candy in total. $21\div3=7$ 
Eve brings $$12$$ pieces of candy, Alice brings $$9$$ pieces of candy and Irene doesn\textquotesingle t bring any candy. They put all the pieces of candy together on a table and divide them equally among themselves. How many pieces of candy does each of the girls get? (2012 Math Kangaroo Problem, Levels 1-2, Question \#15） 
Options:
1: $$3$$ 
2: $$7$$ 
3: $$8$$ 
4: $$9$$ 
5: $$12$$ 