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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 M

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. QJ-2M-0 DJM-2 UM-2)=0 6-M-2

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