a)40 litri lapte .............15 kg branza
100litri lapte .............x kg branza
x=100×15/40=37,5 kg branza
40 litri lapte .............15 kg branza
60litri lapte .............x kg branza
x=60×15/40=22,5 kg branza
b)40 litri lapte .............15 kg branza
x litri lapte .............112,5 kg branza
x=40×112,5/15=300 litri lapte
40 litri lapte .............15 kg branza
x litri lapte .............22,5 kg branza
x=40×22,5/15=60 litri lapte