R.D = (M in air - M in liquid) / (M in air -M in water)
2 = (M - 10) / (M - 15)
M - 10 = 2(M - 15)
M - 10 = 2M - 30
M - 2M = -30 + 10
-M = -20
M = 20
the mass of a stone is 15.0g when completely immersed in water and 10.0g when completely immersed in a liquid of relative density 2.0. what is the mass of the stone in air
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