Discussion
A wet solid containing 20 per cent water is dried to 5 per cent water. How much water is removed per 100 kilograms of wet feed?
Answer: D
Eighty kilograms of dry solid at ninety-five per cent gives a product of about eighty-four point two kilograms, so about fifteen point eight kilograms of water leaves. Subtracting the percentages directly gives fifteen and is wrong.
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