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Zosia - 1,5x
x/1,5x = 2/3
Kwota Filipa stanowi 2/3 kwoty Zosi.
Zosia --- x + 50% * x = x + 0,5x = 1,5x zł
x / 1,5x = 1 : 1,5 = 1 : 3/2 = 1 * 2/3 = 2/3
odp. 2/3 kwoty Zosi to kwota Filipa.