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9+0,55x=x
9=0,45x
x=20zl
9+0,3x+0,25x=x
0,45x=9
x=20
100%-55%= 45%
45% - 9zł
100% - x
x= 9×100÷45
x= 900÷45
x= 20zł
Odp: Prezent kosztuje 20zł.