The moisture content of sludge is reduced from 90% to 80% in a sludge digestion

Question

The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

Options:

A . 25 %

B . 50 %

C . 10 %

D . 5 %

Answer: Option B

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