1. M= 720g si T= 0,125, atunci:
T= m/M
m= T•M= 720•0,125= 90 g argint
2. m=120 g aur
M= 120+380=500g aliaj
T= 120/500=30/125=6/25
T=0,24
3.M1=800g
T1=0,25
m1=M1•T1=800•25/100= 200 g
m2= 200 g
m1+m2= 200+200=400g
M2= M1+m2=800+200
M2=1000g
T2=m1+m2/M2=400/1000=0,4
5. T=0,600
m=1200 g
T=m/M
M=m/T=1200/0,600=2000g
