Asked by Pearl

Christian is 3 times as old as Marie. Marie is 12 years younger than Christian. How old is Christian?
Answered by PsyDAG
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.
Answered by Pearl
Thank you, PsyDAG. I needed this for a 5th grader.
Answered by PsyDAG
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