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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） 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability
They have $12+9=21$ pieces of candy in total. $21\div3=7$ 