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0,5*22,2=11,10 zł
1,5 kg kiełbasy
22,2+11,1 = 33,3 zł
b) 0,5 kg - 3,4 zł
1,5 kg - x zł
0,5x = 3,4*1,5 =5,1
x=10,2 zł
c) 0,2 kg * 15 zł = 3zł