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⇔ ρ₁V₁g + ρ₂V₂g = ρ₃V₃g
⇔ ρ₁V₁ + ρ₂V₂ = ρ₃V
ρ₁ = 1000 g/cm³ ,
ρ₃ = 700 g/cm²,
V₁ = ²/₅V
V₂ = ³/₅V
ρ₃ = 500 g/cm³