Multiple choice

A $50$ ml after-shave lotion at $30\%$ alcohol is mixed with $30$ ml of pure water. What is the percentage of alcohol in the new solution?

  1. $18.75$%
  2. $28.75$%
  3. $38.75$%
  4. $48.75$%
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A Correct answer
Explanation

Initial alcohol = 30% of 50ml = 15ml. Total volume = 50ml + 30ml = 80ml. New percentage = (15 / 80) * 100 = 18.75%.

AI explanation

The amount of alcohol in the initial 50 ml solution is 30% of 50, which equals 15 ml. When mixed with 30 ml of pure water, the new total volume becomes 80 ml, while the amount of alcohol remains 15 ml. The new percentage of alcohol is (15 / 80) * 100, which equals 18.75%.

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