SOLUTION: Mary's sister is 7 years older than Mary.Their combined ages add up to 35. How old is Mary?
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Question 235127: Mary's sister is 7 years older than Mary.Their combined ages add up to 35. How old is Mary?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Let 
represent Mary's age. Then 
represents Mary's sister's age.
\ =\ 35)
Solve for
John
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