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o-wiek ojca
s+o = so = 39 lat
(s + 3)4 = o+3 =(39+2 • 3=39+6 =45)
4s+12 =o+3 =45
45 - 12 = 4s
33 : 4s = 8,25
s=8,25
o = 4 • 8,25 = 33 + 3 = 36 : 4 = 9 - 3 = 6
Odp.: Ojciec ma 33 lata, a syn 6.