Question 931190
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Hi
Let x and y represent the son's and father's ages respectively 
 y - 4 = 3(x-4)  0r y = {{{3x-8}}}
......
y + 5 = 2(x+5)
(3x-8) + 5 = 2x + 10
x = 13, son's age.  Father is 31 {{{3*13-8}}}
And...checking
27 = 3(9)  and 36 = 2(18)