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Mathematics, 31.01.2020 15:01 rhaquan66766
John is twice as old as mary. the sum of their ages is 21. how old is mary? let j = john's age and m = mary's age. select the system equations that represents the problem.
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John is twice as old as mary. the sum of their ages is 21. how old is mary? let j = john's age and...
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