Multiple choice

A quantity of $30$ ml of $20\%$ alcohol is mixed with $20$ ml of $25 \%$ alcohol What is the strength of alcohol in the mixture?

  1. $20\%$
  2. $27\%$
  3. $30\%$
  4. $22\%$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total alcohol = (30 * 0.20) + (20 * 0.25) = 6 + 5 = 11 ml. Total volume = 30 + 20 = 50 ml. Strength = (11 / 50) * 100 = 22%.

AI explanation

The amount of alcohol in the first solution is 20% of 30 ml, which equals 6 ml. The amount in the second solution is 25% of 20 ml, which equals 5 ml. The total amount of alcohol is 11 ml in a total mixture of 50 ml, so the final strength is (11 / 50) * 100, which equals 22%.

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