Question
Yen spent 4 days making paper boxes for her sisters. Each day, she managed to make 7 more paper boxes than the day before. She made a total of 78 paper boxes. How many paper boxes did she make on the first day?
2 m

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Yen spent 4 days making paper boxes for her sisters. Each day, she managed to make 7 more paper boxes than the day before. She made a total of 78 paper boxes. How many paper boxes did she make on the first day?