A graduated cylinder has a mass of 80 g when empty. when 20 ml of water is added, the graduated cylinder has a mass of 100 g. if a stone is added to the graduated cylinder, the water level rises to 45 ml and the total mass is now 156 g. what is the density of the stone

Mass of the rock

100 - 80 = 20g (water mass)

100 + 20 = 120g (total mass)

156 - 120 = 36g (rock mass)

Volume of the rock

V of water after adding rock - v of water before adding the rock

45 - 20 = 25 m^3 (volume of rock)

Density of the rock

Density = Mass/Volume

Density = 36/25

Density = 1.44 g/m^3