1 .	In a 3 litre mixture of water and milk, 50% is milk. How much water should be added so that the percentage of milk becomes 20%?
[ A ]    1.5 litre [ B ]    4.5 litre [ C ]    2.5 litre [ D ]    3 litre
Answer : Option B Explanation : Milk = 1.5 litre Let us add ‘x’ litre water now the total mixture is (x+ 3) litre ∴ (x+ 3) × $20\over100$ = 1.5 ==> x= 4.5 litre
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