a)
80000kg Cu din care 1% se transforma in cocleala ==>
800kg Cu se transforma in m kg cocleala :
20m/100 kg CuO
30m/100 kg Cu(OH)2
50m/100 Kg CuCO3
80 kg CuO........64kg Cu
m/5 kg CuO........x=8m/50 kg Cu
98 kg Cu(OH)2.........64kg Cu
3m/10 kg Cu(OH)2......y= 9,6m/49 kgCu
124 kg CuCO3.......64 kg Cu
m/2 Kg CuCO3........z=8m/31 kg Cu
8m/50 + 9,6m/49 + 8m/31 =800 ==> m=1303 kg cocleala
b)m statuie= m initial -m Cu coclit + m cocleala=225000-800+1303= ... kg