Question
Cathy and Natalie had an equal number of buttons at first. Cathy used 15 of her buttons and Natalie used 16 of her buttons. They used 77 buttons altogether. How many buttons did Natalie have in the end?
4 m

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Cathy and Natalie had an equal number of buttons at first. Cathy used 15 of her buttons and Natalie used 16 of her buttons. They used 77 buttons altogether. How many buttons did Natalie have in the end?