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**40 litres of a mixture of milk and water contains 10% of water, the water to be added, to make the water content 20% in the new mixture. Find how many litres water will be added ?**

A. 6 litres
B. 6.5 litres
C. 5.5 litres
D. 5 litres
**Answer: Option D**

## Show Answer

Solution(By Apex Team)

Water content in 40 litres of mixture.
$\begin{aligned}&=40\times\frac{10}{100}\\
&=4\text{ litres }\\
&\text{∴ Milk in the mixture.}\\
&=40-4\\
&=36\ \text{litres}\\
&\text{Let x litres of water is mixed}\\
&\Rightarrow\frac{4+x}{40+x}=\frac{20}{100}\\
&\Rightarrow x=5\text{ litres }\end{aligned}$

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