4. A solution is 40% alcohol. How much pure alcohol must be added to 200 ml of the solution to make it 50% alcohol?
Question
Solution 1
Step 1: Determine the amount of alcohol in the initial solution.
The initial solution is 40% alcohol and its volume is 200 ml. So, the amount of alcohol in it is 40/100 * 200 = 80 ml.
Step 2: Let's denote the amount of pure alcohol to be added as X ml.
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