A mixture of 240 litres of juice and water contains 15% water. How much more water (in litres) should be added to this so that the strength of water will become 25% in the new mixture?

Total quantity of mixture = 240 litres

=> Quantity of water in it = $$\frac{15}{100}\times240=36$$ litres

Let $$x$$ litres of water is added. According to ques,

=> $$36+x=\frac{25}{100}(240+x)$$

=> $$4(36+x)=240+x$$

=> $$144+4x=240+x$$

=> $$4x-x=240-144$$

=> $$3x=96$$

=> $$x=\frac{96}{3}=32$$

$$\therefore$$ 32 litres of water should be added to this so that the strength of water will become 25% in the new mixture.

=> Ans - (B)