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A batch is weighed out as 270 kg clay, 150 kg feldspar, 150 kg quartz and 30 kg talc. What percentage is clay?

  • A.54 per cent
  • B.40 per cent
  • C.45 per cent
  • D.27 per cent

Answer: C

The batch totals 600 kilograms and 270 of those are clay, which is 45 per cent. Converting a weighed batch back to percentages is how a recipe is recovered from a works record. Percentages also let two recipes be compared directly.

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