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1 November, 15:10

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.

J - 2M = 0

M - 2J = 0

J + M = 21

J = M + 2

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Answers (1)
  1. 1 November, 15:16
    0
    J = 2m

    J + M = 21

    J + M = 21 is your answer.
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