A mixture of 20 kg of sprit and water contains 10% water. How much water must she added to mixture to raise the percentage of water to 25%

A mixture of 20 kg of sprit and water contains 10% water. How much water must she added to mixture to raise the percentage of water to 25% Correct Answer 4

water = 20×(10/100) = 2 kg So, Spirit = 20 - 2 = 18 kg In new mixture water is 25%, So, Spirit 75% ATQ, 75% = 18 ∴ 25% = (18/75) x 25 = 6 Water needs to add = 6 - 2 = 4kg Ans. 
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