Question 1110671
6 and 12


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How to solve:
Assign a variable, preferably to Martin's age but you can assign one to William instead.


Martin, M
If William is HALF of Martin in age, then this is  M/2.


Maybe easier to recognize that if William is some age w, then Martin is age 2w.


The sum of their ages was given as 18, so {{{w+2w=18}}}.
Solve for w, and you have William's age.  Use this to get Martin's age.