Question
Mary and Shiyun have some cards. If Mary gives 35 cards to Shiyun, Shiyun will have 4 times the number of cards as Mary. If Shiyun gives 4 cards to Mary, Mary will have 25 as many cards as Shiyun. How many cards does Mary have at first?
4 m

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Mary and Shiyun have some cards. If Mary gives 35 cards to Shiyun, Shiyun will have 4 times the number of cards as Mary. If Shiyun gives 4 cards to Mary, Mary will have 25 as many cards as Shiyun. How many cards does Mary have at first?