0,1cm*5cm*5cm=2,5cm^3
I probówka
2,5cm^3 - 6,75g
1cm^3 - x[g]
-------------------------------------------------z proporcji
x=6,75*\frac{1}{2,5}=2,7g
Ten metal to glin.
II probówka
2,5cm^3 - 19,65g
1cm^3 - x[g]
------------------------------------------
x=\frac{19,65g*1cm^3}{2,5cm^3}=7,86g
Ten metal to stal.