Question

# A tank can hold 50 litres of water. At present, it is only 30 % filled. How many litres of water shall we put in the tank so that its 50 % filled?

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Hint: To solve this question, we will find what is 1 % of the total volume of the tank. Then, we will find the litres of water when the tank is 30 % filled and litres of water when the tank is 50 % filled. Then we will find the difference between these values and the result will be the litres of water we shall put in the tank so that it increases from 30 % filled to 50 % filled.

Thus, 1 % of the 50 litres is given as $\dfrac{1}{100}\times 50$ litres = 0.5 litres.
Therefore, 30 % of 50 litre capacity tank = 0.5 $\times$ 30 = 15 litres
Therefore, 50 % of 50 litre capacity tank = 0.5 $\times$ 50 = 25 litres