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From 5 litres of a 20% solution of alcohol in water, 2 litres of solution is taken out and 2 litres of water is added to it. Find the strength of alcohol in the new solution.
Answer & Solution
Correct Answer:
Option
B
Quantity of alcohol in 5 litres solution = 20% of 5 litres = 1 litre
Quantity of alcohol removed = 20% of 2 litres = 400 ml
Quantity of alcohol in new solution :
= (1000 - 400)ml
= 600 ml
∴ Strength of alcohol in new solution
$$\eqalign{ & = \left( {\frac{{600}}{{5000}} \times 100} \right)\% \cr & = 12\% \cr} $$
Quantity of alcohol removed = 20% of 2 litres = 400 ml
Quantity of alcohol in new solution :
= (1000 - 400)ml
= 600 ml
∴ Strength of alcohol in new solution
$$\eqalign{ & = \left( {\frac{{600}}{{5000}} \times 100} \right)\% \cr & = 12\% \cr} $$
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