Question
Irene baked some cookies and packed them into boxes for her friends. Each box can hold 9 apple cookies and 3 banana cookies. She packed a total of 81 apple cookies. How many banana cookies did she pack altogether?
4 m

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Irene baked some cookies and packed them into boxes for her friends. Each box can hold 9 apple cookies and 3 banana cookies. She packed a total of 81 apple cookies. How many banana cookies did she pack altogether?