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p(100+50)=3,5%*100+5%*50
150 p=350%+250%
150p=600%
p=600%/150
p=4% tłuszczu ma otrzymane mleko
50l*0,05=2,5l
100l+50l=150l
2,5l+3,5l=6l
150l-100%
6l=x%
6l*100%/150l=4%