If 20 mL of ethanol (density = 0.7893 g/mL) is mixed with 40 mL water (density = 0.9971 g/mL) at 25° — AITS & Test Series Chemistry Question

Question

If 20 mL of ethanol (density = 0.7893 g/mL) is mixed with 40 mL water (density = 0.9971 g/mL) at 25°C, the final solution has density of 0.9571 g/mL. Calculate the percentage change in total volume of mixing.