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y - wiek syna obecnie
x-10 = 6*(y-10)
x+10 = 2(y+10)
x-10 = 6y-60
x+10 = 2y+20
x = 6y-50
x = 2y+10
2y+10 = 6y-50
10 = 4y-50
60 = 4y /:4
y = 15
x = 2y+10
x = 2*15+10 = 30+10 = 40
Odp. Ojciec ma 40 lat, a syn 15.