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OpenStudy (anonymous):
John is twice as old as Mary. The sum of their ages is 52. How old is Mary? If J = John's age and M = Mary's age, which system of equations could be used to solve the problem? A. 2J = M and J + M = 52 B. J = 2M and J + M = 52 C. J = 2M and JM = 52
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