Răspuns: ro= m/v
V,apa= 200ml ro= 1g/ml----> m,apa= 200g
m,alcool= 120g ro= 0,8g/ml---> v,alcool= 150ml
v,amestec= 350ml; m,amestec=320g
ro, amestec= m,amestec/v,amestec= 320/350g/ml=0,914g/ml v,amestec extras= m,amestec extras/ro,amestec= 150g/0,914g/ml=164 ml
Explicație: