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A slip is 70 per cent solids by mass. How much dry powder is present in 40 kg of slip?

  • A.28 kg
  • B.12 kg
  • C.70 kg
  • D.40 kg

Answer: A

Correct answer: 28 kg

\[ 0.70 \times 40 = 28\ \mathrm{kg}. \] The remaining 12 kg is the liquid that must be removed by drying, which is why a high solids content is worth achieving - every kilogram of water is energy spent evaporating it and a risk of agglomeration as it goes.

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