The mass of a glass jar half filled with oil (by volume) is 1 m = 1.5 kg. To fill the jar completely, water was added

The mass of a glass jar half filled with oil (by volume) is 1 m = 1.5 kg. To fill the jar completely, water was added to it weighing 2 m = 1.5 kg. Determine the mass of the empty can. The density of oil is 3 m ρ = 800 kg / m, the density of water is 3 in ρ = 1000 kg / m.

we know that half a can of 1.5 liters, which means the volume of the entire can is 1.5 * 2 = 3 liters
from this it follows that the mass of oil is 0.8 * 1.5 = 1.2 kg
means the mass of an empty can is 1.5-1.2 = 0.3 kg
Answer: 0.3kg