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Question
A tank can hold 50 litres of water. At present, it is only 30% full. How many litres of water will fill the tank, so that it is 50% full?
Solution
Total capacity of the tank = 50 litres
Percentage to be filled = 50 - 30%
= 20%
The amount of water to be filled = `20/100xx50`
= 10 litres
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