Density calculation problem

Density: the mass of an empty bottle is 200g, and the total mass when it is filled with water is 700g. If it is used to hold another liquid, the total mass after it is filled is 600g. Identify the type of this liquid. The mass of water is M1 = 700-200 = 500g = 0.5kg, the volume of bottle = volume of water, v = m / P = 0.5 / 10 ^ 3 = 0.5 * 10 ^ (- 3) m ^ 3, and the mass of another liquid is M2 = 60

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