One liter of a liquid whose specific volume is $0.0003 \mathrm{~m}^{3} / \mathrm{kg}$ is mixed with 2 liters of a liquid whose specific volume is $0.00023 \mathrm{~m}^{3} / \mathrm{kg}$ in a container whose total volume is 3 liters. What is the density of the resulting mixture, in $\mathrm{kg} / \mathrm{m}^{3} ?$