The task is to generate the correct answer for a given math problem.

Q: Problem: if the cost price of 50 articles is equal to the selling price of 40 articles , then the gain or loss percent is ?

A: 25 %
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Q: Problem: find the greatest number that will divide 205 , 626 and 588 leaving 5 , 6 and 8 as remainders respectively

A: 2
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Q: Problem: mixture contains alcohol and water in the ratio 4 : 3 . if 5 liters of water is added to the mixture , the ratio becomes 4 : 5 . find the quantity of alcohol in the given mixture .

A:
10
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