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1.2x=x+30 / *10
12x=10x+300
12x-10x=300
2x=300 /2
x=150
ania zna 150 slowek
y- ilość słówek poznanych przez Kasie
y+30=x y=150
} }
y×120%=x 150+30=x
y+30=x y=150
} }
- 1,2y=x x=180
_________
-2y+300=0
y=150
Ania zna 180 słówek, a Kasia 150.