Christian is 3 times as old as Marie. Marie is 12 years younger than Christian. How old is Christian?

Answer 1

C = 3M

C - M = 12

Substitute 3M for C in the second equation and solve for M. Insert that value into the first equation to solve for C. Check by putting both values into the second equation.

Answer 2

Thank you, PsyDAG. I needed this for a 5th grader.

Answer 3

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