Question

A tank can hold 50 litres of water. At present it is only 30%full, how many litres should I put in the tank so that it is 50%full

Answer 1

Step-by-step explanation:

when 100% of tank is full, it holds 50 liters

At present it is 30% full. We have to add 20% more to make it 550

Now the tank has 30% of 50 liters

= 30/100 ×50

= 15 liters

At present it is 15 liters full.

Now we have to fill 20% more, i.e 20/100 × 50 liters

= 10 litres

Therefore 10 litres.

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