NTSE Stage 2 SAT 2015 Question Paper

The solubility of a substance S in water is 28.6% (mass by volume) at 50°C. When 50mL of its saturated solution at 50°C is cooled to 40°C, 2.4 g of soild S separates out. The solubility of S in water at 40°C (mass by volume) is :