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$25\%$ of $40 = \frac{25}{100} \times 40 = 10.$

So, $10$ litres of water and $30$ litres of milk out of $40$ litres of mixture.

$10$ more litres of water is added. So, we have $30$ litres of milk out of $40+10 = 50$ litres of mixture

$\implies \frac{30}{50}\times 100 = 60\%$
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