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słoik: 1/3l
2 puszki + słoik: 2*0,3l + 1/3l = 6/10 + 1/3 = 18/30 + 10/30 = 28/30 = 14/15l
2x0,3=0,6
1/3 =33,3/100
0,6 + 33,3 = 0,93 co daje w przyblizeniu 0,9