exam Maths Puzzle Numerical Ability

Please help me with this so I can get on with the rest of my math. I really appreciate your help
This problem set involves a formula (a rational function) with which a new tortil

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Please help! Can you explain to me or show me how to do the following problem :

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Line L and M in plane ABC intersect at point C One hundred liters of a solution was available, but the solution was 65% alcohol. Barry needed a solution which was 50% alcohol. How many liters of alcohol had to be extracted so that the solution would be 50% alcohol?