Discussion
Consider the following statements about extraction rate:
1. It is the flour obtained as a percentage of wheat milled.
2. Raising it increases the ash content of the flour.
3. Wholemeal flour has an extraction rate of about seventy-five per cent.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: extraction is flour as a percentage of wheat milled, and raising it brings in fractions nearer the bran, so ash rises. Statement 3 is well out - wholemeal is by definition the whole grain, so its extraction is about 100 per cent. Seventy-five per cent is roughly the figure for ordinary white flour.
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