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20 x 2=40
wiek mamy=40 lat
Brat Karola
6+5= 11
Siostra Karola
6 / 2 = 3
Razem
6+11+3 = 20
Mama Karola
2 x 20 = 40
Mam Karola ma 40 lat!
20=1/2x
x=40