A soap factory makes 600 units in 9 days with help of 20 machines. How many units can be made in 12 days with the help of 18 machines?
Units made are proportional to days and machines. (600 units / (9 days * 20 machines)) = (X units / (12 days * 18 machines)). Solving for X gives 720 units, making other options incorrect calculations.