Question
Justin bought 4 bags of postcards. In each bag, there were 15 postcards. He used 4 of the postcards and gave some of them to his sister. 56 of his postcards were then left. What fraction of the postcards he bought were given to his sister?
4 m

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Justin bought 4 bags of postcards. In each bag, there were 15 postcards. He used 4 of the postcards and gave some of them to his sister. 56 of his postcards were then left. What fraction of the postcards he bought were given to his sister?