Mathematics, 11.06.2021 16:30 Joustian

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 = M + 2
M - 2J = 0
J + M = 21
J - 2M = 0

Answers: 1

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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 = Mary's age. Select the system equations that represents the problem. J = M + 2 M - 2J = 0 J + M = 21 J - 2M = 0

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Another question on Mathematics

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 = M + 2
M - 2J = 0
J + M = 21
J - 2M = 0