Question

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

Answer 1

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