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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. - Mathematics

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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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