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3x - wiek matki
3x +8 = 220%(x+8)
3x +8 = 2,2x + 17,6
0,8x = 9,6
x = 12 - syn
3x = 36 - matka
y- wiek matki
220% = 2,2
układ równań
3x=y
2,20(x+8)=y+8
y=3x
2,2x+17,6=y+8
y=3x
2,2x+17,6=3x+8
y=3x
9,6=0,8x
x=12 -wiek syna
y=3x=3*12=36 -wiek matki