Question 318273
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Let *[tex \Large x] represent the father's age.  Let *[tex \Large y] represent the son's age.


Situation now:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ =\ 3y]


Situation 5 years ago:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ -\ 5\ =\ 5(y\ -\ 5)]


Substitute:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 3y\ -\ 5\ =\ 5(y\ -\ 5)]


Solve for *[tex \Large y] to get the son's present age.  The rest follows directly.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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