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A sieve nest retains \( 12 \), \( 34 \), \( 40 \) and \( 14 \) g on four decks. The mass fraction on the third deck is

  • A.12 per cent
  • B.40 per cent
  • C.34 per cent
  • D.14 per cent

Answer: B

The total is \( 100 \) g, so the third deck holds forty per cent of the sample. Cumulative totals from such a nest give the particle size distribution that the miller actually works from day to day in setting the mill.

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