Finding The Rock Mass Using Archimedes Principle | Fluid Statics | 11th Class Physics

A stone tied to a rope. When this rock is completely immersed in water (density 1 gr/cm³), the tension in the string is 30 N. When this rock is completely immersed in oil (density 0.8 gr/cm³), the tension in the string is 35 N. The question is,what is the mass of the rock?

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