Question

Joan mixed two liquids;M of density 0.8 g/cm cubed and N of density 1.2 g/cm cubed.The total volume of the mixture was 100 cm cubed and its density was 1.04 g/cm cubed.Calculate the volume of M.

Answer 1

$$\rho=\frac{\rho_MV_M+\rho_N(V-V_M)}{V}$$

$$1.04=\frac{0.8V_M+1.2(100-V_M)}{100}$$

$$V_M=40\ cm^3$$