8 litres of water is added to 32 litres of a solution containing 20% of alcohol

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Question

8 litres of water is added to 32 litres of a solution containing 20% of alcohol in water. What is the approximate concentration of alcohol in the solution now ?

Options:

A . 24%

B . 16%

C . 8%

D . 12%

Answer: Option C
Answer: (c)In 32 litres of solution, Alcohol = ${32 × 20}/100$ = 6.4 litres Water = 32 – 6.4 = 25.6 litresOn adding 8 litres of water,Required percent = $6.4/40 × 100$ = 16%

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