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A chemical solution contains 30% water and 70% alkali. What quantity of water should be added to 6 litres of solution so that the water content becomes 40%?

600 ml

1.2 litres

800 ml

1 litre

Explanation:

Total Solution = 6 litres
Water Content = 6*30% = 1.8 litres
Alkali Content = 6*70% = 4.2 litres
Let quantity of water added = ‘x’ litres
Required expression after adding water = (Water/Total Solution) * 100% = 40%
(1.8 + x)/(6 + x) * 100% = 40%
After Solving => x = 1 litre

By: Deepak Dawra

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