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From 5 litres of 20% solution of alcohol in water, 2 litres of solution is taken out and 2 litres water is added to it. The strength of alcohol in the new solution is 

(a) 12% 

(b) 15% 

(c) 16% 

(d) 18%

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(a) 12%

Quantity of alcohol in 3 litres of solution

\(\frac{20}{100}\) x 3 = \(\frac{3}{5}\)L

Strength of alcohol in new solution = \(\frac{315}{5}\)x 100 = 12%

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