From 5 litres of 20% solution of alcohol in water, 2 litres of solutio

1.	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%
Answer» (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%

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%

Answer»

(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%