I am three times as old as my son. 15 years hence, I will by twice as old as my son. The sum of our ages is
Let's say son's age is $$x$$
hence father's present age will be $$3x$$
after 15 years son's age will be $$x+15$$ and father's age will be $$3x+15$$ and it is twice the age of son
so $$3x+15$$ = 2 ($$x+15$$)
solve for $$x$$
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