Inside a sizeable vessel at an oil refinery, three oils with different densities are blended together. No chemical reaction takes place. The mixture contains: 1200 kg of oil with density $1100\ \text{kg m}^{-3}$ 1500 kg of oil with density $860\ \text{kg m}^{-3}$ 4000 kg of oil with density $910\ \text{kg m}^{-3}$. What is the density of the mixture?
- A$927\ \text{kg m}^{-3}$
- B$933\ \text{kg m}^{-3}$
- C$957\ \text{kg m}^{-3}$
- D$1045\ \text{kg m}^{-3}$