Initial volume of graduated cylinder = 30.0 mL
Final volume of graduated cylinder after adding rock = 75.0 mL
Volume of the rock = Final volume of graduated cylinder after adding rock - Initial volume of graduated cylinder
= (75.0 - 30.0) mL
= 45.0 mL
Mass of the rock = 55.0 g
[tex] \rm Density = \dfrac{Mass}{Volume} \\ \\ \rm = \dfrac{55}{45} \\ \\ \rm = 1.23 \: g/mL[/tex]
[tex] \therefore [/tex] Density of the rock = 1.23 g/mL
