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2,5l wody
2/3 l + 2,5 l = 2/3 l + 2 i 5/10 l = 20/30l + 25/10l = 20/30l + 75/30l = 95/30l = 3 i 5/30 l = 3 i 1/6 litra soku
gdzie kreska / oznacza po prostu ułamek.
odp: w naczyniu jest 3 i 1/6 l soku. :))