Question
Tiffany and Betty had an equal number of pens at first. Tiffany used 14 of her pens and Betty used 17 of her pens. They used 55 pens altogether. How many pens did Betty have in the end?
4 m

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Tiffany and Betty had an equal number of pens at first. Tiffany used 14 of her pens and Betty used 17 of her pens. They used 55 pens altogether. How many pens did Betty have in the end?