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3kg * ¹³/₂₀=³/₁ * ¹³/₂₀=³⁹/₂₀=1¹⁹/₂₀ kg
1¹⁹/₂₀ /*₅ =1⁹⁵/₁₀₀kg=1,95kg
odp. w 3kg indyku jest 1,95kg mięsa