1. anonymous

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2. math&ing001

We got : 1 kg = 2.20462 lb 1 m^3 = 35.3147 ft^3 So: $921* \frac{ 1 kg }{ 1 m ^{3} } = 921*\frac{ 2.20462 }{ 35.3147 } lb _{m}/ft ^{3}$