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A 60-litre solution of alcohol and water contains 20 litres of alcohol. How much alcohol must be addedto produce a solution of 50% alcohol?100 ton of |
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Answer» Suppose we need to add X litres of alcohol to the solution. So, overall quantity of alcohol = X + 20 litres. But adding the alcohol increases volume of the solution also.So, total volume of solution = 60 + X So, we have the following equation: X+20/(X+60) = 50/100=> 2X + 40 = X + 60=> X = 20 LTherefore, to get a solution of 50% alcohol, we need to add 20 L of alcohol. 20 l of alcohol is needed to get 50% solutions 20l of alcohol........ 20 litre is right answer.... |
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