exam Maths Puzzle Numerical Ability

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?

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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 Think about a real-life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years?
Answer: It would d