Odpowiedzi

2010-01-06T18:06:59+01:00
X+y=45
x=y+25

y+25+y=45
x=y+25

2y=45-25
x=y+25

2y=20
x=y+25

y=10
x=10+25

y=10
x=35

Bartek ma 10 lat a jego tata 35 lat
2010-01-06T18:09:25+01:00
2x + 25 = 45 45-10 = 35 ojciec
2x = 45 - 25
2x = 20 / 2
x = 10 Bartek

Bartek 10 lat
Tata 35