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y- wiek 1 córki
z - wiek drugiej córki
x+y+z= 62
x-23=y
x-26=z
podstawiamy
x +x-23+x-26=62
3x= 111
x=37
y=x-23= 14
z=x-26= 11
Matka ma 37 lat, a córki 14 i 11 lat