MCQ
A mixture of 40 litres of milk and water contains 10% of water. How much water is to be added to the mixture so that the water maybe 20% in the new mixture.
Options
5 Litres
4 Litres
6.5 Litres
7.5 Litres
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Solution
5 Litres
Explanation:
In a mixture of 4-litre water is 10% i.e. 4 litres.
Let x litre of water be added.
According to the question,
`(4+"x")/(40+"x")=20/100=1/5`
20 +5x = 40 + x
4x = 20
x = 5
Concept: Percentage, Discount and Partnership (Entrance Exam)
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