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Question
A mixture of 20 kg of spirit and water contains 10% water . How much water must be added to mixture to raise the percentage of water to 25%
2 kg
4 kg
5 kg
6 kg
ANSWER : 2
Descrption
<p>water = (20*10)/100 = 2kg</p><p>spirit = 20kg-2kg = 18kg</p><p>now, the new percentage of spirit : water will be = 75 : 25 = 3 : 1</p><p>Let, <i>P kg water </i>must be added to mixture.</p><p>so, <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>18</mn><mrow><mn>2</mn><mo>+</mo><mi>P</mi></mrow></mfrac><mo> </mo><mo>=</mo><mo> </mo><mfrac><mn>3</mn><mn>1</mn></mfrac></math></p><p> 6+3P = 18</p><p> 3P = 12</p><p> <strong>P = 4 kg (Ans)</strong></p>
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