Ratio,Proportion, Percentages and Discounting Q.10

0. A mixture of 40 l of milk and water contains 10% water. How much water should be added to it so that water may be 20% in the new mixture?

Answer
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Option : A
Explanation : Let x water to be added to make water 20% of new mixture.
Water in old mixture = 10% of 40 = 4 l
Water in new mixture to make it 20% = (4 + x) l
Now 20% of (40 + x) l = 4 + x
Solving equation, we get x = 5 l.

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