How much water must be added to $300$ litre of a solution so that its concentration may change from $25 %$ to $20 %$ ?

70

litre.

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75

litre.

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67

litre.

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98

litre.

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Solution

The correct option is B $75$ litre.
Let $x$ litres of water must be added .
Therefore, $25 %$ of $300 = 20 % (300 + x)$
$\Rightarrow 75 = 60 + 0.2 x$
$\Rightarrow 0.2 x = 15$
$\Rightarrow x = 75$
Therefore, $75$ litres must be added to $300$ litters of the $25 %$ solution.

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