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t - wiek taty
b + t = 45
b + 25 = t
b + b+ 25 = 45
t = b+25
2b = 20
t= b+25
b=10
t = 35
Bartek ma 20 lat a jego tata 45lat
y-wiek bartka
{x+y=45
{x=y+25
{y+25+y=45
{x=y+25
{2y=45-25
{x=y+25
{2y=20 / :2
{x=y+25
{y=10
{x=10+25
{y=10
{x=35
Odp. Tata ma 35 lat, a Bartek 10.