Mathematics, 12.11.2020 17:10 miaaa0
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
J = M + 2
M - 2J = 0
J + M = 21
Answers: 2
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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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