A mixture of 40 litres of milk and water contains 10 $%$ water. How much water must be added to make water 20 $%$ in the new mixture?

8 lts

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5 lts

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7.5 lts

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9 lts

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6 lts

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Solution

The correct option is B
5 lts

Impure Milk : Water = 8:1

$Therefore, if there is 40 litres of impure milk, quantity of water is \frac{40}{8} \times 1 = 5 litres.$

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