A mixture of 20 kg of spirit and water contains 10% water. How much water must be added to this mixture to raise the percentage of water to 25% ?

A mixture of 20 kg of spirit and water contains 10% water. How much water must be added to this mixture to raise the percentage of water to 25% ? Correct Answer 4

Amount of water in the mixture = 10% of 20 kg = 2 kg So, amount of spirit = 20 - 2 = 18 kg Percentage of spirit in new mixture = 100 - 25 = 75% Now, 75% of mixture = 18 kg So, 100% of mixture = 18 x 100 / 75 = 24 kg So, amount of water need to be added = 24 - 20 = 4 kg
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"I am a person who thinks about the nature of the spirit when I write. I think about what can't be known and only imagined. I often sense a spirit or force or meaning beyond myself. I leave it open as to what the spirit is, but I continue to make guesses."