A tank can hold $50$ litres of water.At present, it is only $30 %$ full.How many litres of water shall I put in to the tank so that it becomes $50 %$ full?

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Solution

Capacity of tank $= 50$ litres.
$30 %$ of capacity $= 30 %$ of $50$ litres
$= \frac{30}{100} \times 50 = 15$ litres
$50 %$ of capacity $= 50 %$ of $50$ litres
$= \frac{50}{100} \times 50 = 25$ litres
Water need to bring it to $50 %$ capacity $= 25 - 15 = 10$ litres.

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