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y-wiek ani
z-wiek mamy
x+y+z=65
3(x-4)=z
(x-4)=3y
podstawiam te dwa ostatnie rownania do 1
x+1/3(x-4)+3(x-4)=65
x+1/3x-4/3+3x-12=65
41/3x=78 1/3
13/3x=235/3
x=18
Marysia ma 18 lat
z=3(18-4)=3*14=42
Mama ma 42 lat
Ania ma 5 lat