A solid of density 900 kg/m³ floats in oil. The oil floats on water of density 1000 kg/m³ . The density of oil in kg/m³ could be.  

The correct answer is 950.

Explanation:

• If the solid with a density of 900 kg/m³ is able to float in the oil and the oil, in turn, floats on water with a density of 1000 kg/m³, then indeed the density of the oil must be between the densities of the solid and the water.
• A solid of density 900 kg/m3 floats in oil as the density of solid is less than that of oil.
• And the oil floats in water as its density is less than that of water.
• So, the density of oil must be between 900 kg/m3 to1000 kg/m3.
• Therefore, the density of oil could be 950 kg/m3.
• This density would allow the solid to float in the oil, and the oil would float on the water.

Thus, A solid of density 900 kg/m3 floats in oil. The oil floats on water of density 1000 kg/m3. The density of oil in kg/m3 could be 950 kg/m3.