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1kg---------x
x=3,78:1,35
x=2,8 (zł) tyle kosztuje 1 kg jablek
1,35kg=1350g
1350g-6jablek
x--------5 jabłek
x=(5 razy1350):6
x=1125(g)
1125g=1,125kg - waga
1,125 razy 2,8(bo tyle za kg)=3,15 (zł) tyle zaplacisz za 5 jablek