Question
Emma and Betty had an equal number of cards at first. Emma used 12 of her cards and Betty used 19 of her cards. They used 99 cards altogether. How many cards did Betty have in the end?
4 m

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Emma and Betty had an equal number of cards at first. Emma used 12 of her cards and Betty used 19 of her cards. They used 99 cards altogether. How many cards did Betty have in the end?