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A mixture of 45 litres of spirit and water contains 20% of water. How much water must be added to it to make the 25% in the new mixture?1. 5 litres2. 6 litres3. 4 litres4. 3 litres |
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Answer» Correct Answer - Option 4 : 3 litres Given: Total mixture of spirit and water = 45 litres Percentage of water in mixture = 20% Calculation: Let x litre of water must be added to make it 25% in the new mixture Percentage of water in mixture = 20% of 45 litres ⇒ (20/100 × 45) ⇒ 9 litres According to the question ⇒ (9 + x)/(45 + x) = 25/100 ⇒ (9 + x)/(45 + x) = 1/4 ⇒ 36 + 4x = 45 + x ⇒ 3x = 9 ⇒ x = 3 litres ∴ Water should be added is 3 litres |
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