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100% - x
20x = 3000
2x= 300
x= 150
y=ilosc słówek kasi
x=y+20%y=1,2y
x=y+30
1,2y=y+30
1,2y-y=30
0,2y=30
y=30:0,2
y=150
x=150+30=180
ania zna 180słówek
100% = 150