Food waste, paper waste and plastic waste have typical densities of $280 kg/m^3$ , $80 kg/m^3$ , and $50 kg/m^3$ , respectively. The mixed waste is composed of 70% food waste, 20% paper waste and 10% plastic waste. The density of the mixed waste is ______ $kg/m^3$ . (rounded off to 2 decimal places). Neglect compaction effect.

Question

Food waste, paper waste and plastic waste have typical densities of $280 kg/m^3$ ,  $80 kg/m^3$ , and  $50 kg/m^3$ , respectively. The mixed waste is composed of 70% food waste, 20% paper waste and 10% plastic waste. The density of the mixed waste is ______  $kg/m^3$ . (rounded off to 2 decimal places). Neglect compaction effect.

cdquestions Admin · Accepted Answer

Considering the percentages as volumetric contributions rather than mass contributions: $$ \rho_{\text{mixed}} = \frac{1 \, \text{kg}}{0.007 \, \text{m}^3} \approx 142.86 \, \text{kg/m}^3 $$

Correct Answer: 142

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