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Two clays contain 22 and 34 per cent alumina. In what ratio should they be blended to give 26 per cent?

  • A.2 parts of the first to 1 of the second
  • B.1 part of the first to 2 of the second
  • C.1 part of the first to 1 of the second
  • D.3 parts of the first to 1 of the second

Answer: A

The first is 4 below the target and the second 8 above, so they mix in inverse proportion, two to one. The mixing rule works for any two materials blended to a value lying between them. Distances from the target are used in inverse proportion.

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