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John is 4 years older than his sister Mary. Together, their ages add up to 30. How old is Mary?
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John is 4 years older than his sister Mary. Together, their ages add up to 30. How old is Mary?

User Born Ready
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mary is 13
because if john is 4 years older you divide a page up and put 4 on johns side then keep adding til you get to 30

User Shishir Kumar
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