Answer:

20% alcohol means 0.2 litre of alcohol in 1 litre solution {Sol. A}

70% alcohol means 0.7 litre of alcohol in 1 litre solution {Sol. B}

60% alcohol means 0.6 litre of alcohol in 1 litre solution

The Final solution contains 50 litres of 60% alcohol. Thus, the total amount of alcohol in final solution is: 0.6*50= 30 litres

Let the amount of Sol. A added be x litres and amount of Sol. B added be 50-x litres. [50-x because total volume of solution is 50 litres]

Now equating the amounts of alcohol as:

0.2x + 0.7(50-x) = 30

=> x = 10 litres

Explanation:

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