Odpowiedzi

2010-05-04T19:22:34+02:00
X - wiek ojca
y - wiek syna

x = 4y
x + 18 = 2 (y+18)

x = 4y
x + 18 = 2y + 36

x = 4y
4y + 18 = 2y + 36

x = 4y
2y = 18/ :2

x = 4y
y=9

x=36
y=9

pzdr ;)
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