A mixture of 30 litres of spirit and water contains 20% of water in it. How much water must be added to it, to make the water 25% in the new mixture ?
% water in 30 litres of mixture = 20%
=> Quantity of water = $$\frac{20}{100}\times30=6$$ litres
Let $$x$$ litres of water is added
According to ques,
=> $$x+6=\frac{25}{100}\times(x+30)$$
=> $$4x+24=x+30$$
=> $$4x-x=30-24$$
=> $$3x=6$$
=> $$x=\frac{6}{3}=2$$
$$\therefore$$ 2 litres of water must be added to make the water 25% in the new mixture.
=> Ans - (B)
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