Thirty kilograms of solution A contains 80 percent water and 20 percent liquid M. if 50 percent water evaporates from this solution, what percentage in the new solution is liquid M?

Explanation

To solve this problem, first determine the initial composition of the solution: 30 kg of solution A contains 80% water and 20% liquid M. Therefore, there is 24 kg of water and 6 kg of liquid M. When 50% of the water evaporates, 12 kg of water remains, making the new solution total 18 kg (12 kg water + 6 kg liquid M). The percentage of liquid M in the new solution is calculated as (6 kg / 18 kg) × 100%, which equals 33.3%. Hence, the correct answer is 33.3%. The other options reflect incorrect calculations of this percentage.