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160 gr - 100 dag
100 / 40 = 2,5
160:2,5= 64 gr =0,64 zł
odp. Za 40 dag pietruszki zapłacimy 0,64 zł.
a 1 zl = 100 gr
100 - 160 gr
40 - x
x=40*160/100=6400/100=64
odp: za 40 dag pietruszki zapłacimy 64 gr