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3y - wiek mamy
3y + 2 - wiek taty
y + 3y + 3y +2 = 93
7y = 91
y =13 - wiek syna
3y = 39 - wiek mamy
3y +2 = 41 - wiek taty tata
13 + 39 + 41 = 93 - sprawdzenie
b- tata
c- syn
a+b+c=93
3c=a
a+2=b
a+b+c=93
3c+b+c=93
4c+b=93
4c+(a+2)=93
4c+3c+2=93
7c=93-2
c=13
13*3=a
a=39
39+2=c
c=41
39+41+13=93
Chyba dobrze ;)