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y-wiek corki
x+y=48
3y=x
3y+y=48
3y=x
4y=48/:4
3y=x
y=12
3*12=x
y=12
x=36
córka - 48-x
x = 3(48-x)
x = 144-3x
x+3x = 144
4x = 144 |:4
x = 36
mama - 36 lat
córka - 48-36 = 12 lat
m+c=48
m=3c
mamy: c i 3c
c+3c=48
4c=48
c=12
3c=36
mama:36 lat;córka 12 lat