20 litres of mixture of acid and water contain 10% water. How much water should be added so that percentage of water becomes 20% in this mixture? Choose the correct choice from the following answers.
A) 2 L	B) 3 L	C) 2.5 L	D) 4 L	E) 5 L
total mixture =20ltr   water contain = 10% of 20ltr =&gt; 2ltr water   it means 18ltr is acid in that mixture   we have to make 20% water so..20% of 20 = 4ltr water must be there in the new mixture   we have already 2 ltr water so we have to add 2 ltr more   2 LNSWER:2 L
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20 litres of mixture of acid and water contain 10% water. How much water should be added so that percentage of water becomes 20% in this mixture?