Question
Rachel and Yen had an equal number of stamps at first. Rachel used 13 of her stamps and Yen used 17 of her stamps. They used 20 stamps altogether. How many stamps did Yen have in the end?
4 m

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Rachel and Yen had an equal number of stamps at first. Rachel used 13 of her stamps and Yen used 17 of her stamps. They used 20 stamps altogether. How many stamps did Yen have in the end?