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Kasia o 1/2 wiecej od Ani, czyli 9/4 + 1/2 = 9/4 + 2/4 =11/4
Zosia o 5/8 mniej od Kasi, czyli 11/4 - 5/8 = 22/8 - 5/8 = 17/8
Razem: 9/4 + 11/4 + 17/8 = 18/8 + 22/8+17/8 =57/8 = 7,125 litra