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v1=8l
m1= ...??
d=m/v
m=d*v
m1= 16g
d2=3g/l
v2=10l
m2=30g
Dm= (m1+m2)/(v1+v2)
Dm=(16+30)/(8+10)
Dm=46/18
Dm=2.55g/l