Question
Xuan had 40 more cards than Mary at first. Mary gave 17 of her cards to Xuan. Xuan now has 3 times as many cards as Mary. How many cards did Mary have at first?
2 m

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Xuan had 40 more cards than Mary at first. Mary gave 17 of her cards to Xuan. Xuan now has 3 times as many cards as Mary. How many cards did Mary have at first?