SOLUTION: I need an equation for: my age will be three times as old as my youngest son, 30,60. I think the answer is 15 and 45 but I do not know how to do the equation to get these figures.

Question 736463: I need an equation for: my age will be three times as old as my youngest son, 30,60. I think the answer is 15 and 45 but I do not know how to do the equation to get these figures.
I was 30 when he was born so I need an equation which models how old in years each of us will be when I am three times as old as he.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Son's age when Father is 3 times his age
Let = the Father's age then
------------------
The difference in their ages will always be yrs, so
(1)
I am also given:
(2)
-------------
I can substitute (2) into (1)
(1)
(1)
(1)
and
(2)
(2)
---------------
The son is 15 and the father is 45

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