2. Two liquids of different densities \( \left(\rho_{1}=1500 \mathrm{~kg} / \mathrm{m}^{3}, \rho_{2}=\right. \) \( 500 \mathrm{~kg} / \mathrm{m}^{3} \) ) are poured together into a \( 100-\mathrm{L} \) tank, filling it. If the resulting density of the mixture is \( 800 \mathrm{~kg} / \mathrm{m}^{3} \), find the respective quantities of liquids used. Also, find the weight of the mixture; local \( g=9.675 \mathrm{mps}^{2} \).
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