Mathematics, 16.07.2019 17:00 mstahuggoo6102

Hn 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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Hn is twice as old as mary. the sum of their ages is 21. how old is mary? let j = john's age and m...