Final answer:
The question is about preparing a brown sugar milk smoothie and pertains to the concept of percent by mass. However, the specific proportions of RO water and powder can't be determined without additional context because the available options exceed 100% when combined, which is incorrect since percent by mass for a solution must total 100%.
Step-by-step explanation:
The question provided seems to be asking about the preparation of a brown sugar milk smoothie, which involves understanding the concept of percent by mass. Percent by mass is a way of expressing the concentration of a solution by showing what fraction of the total mass of the solution is made up by the solute (in this case, the powder which could be the brown sugar or a flavored mix).
For instance, suppose you want to create a solution with a certain percent by mass. If a solution is prepared by dissolving 25.0 g of sugar into 100 g of water, the mass percent of sugar would be the mass of the sugar divided by the total mass of the solution, then multiplied by 100. Following that formula:
Percent by mass = (mass of solute / (mass of solute + mass of solvent)) x 100%
However, without a specific recipe or concentration, it's impossible to know the exact proportions of RO water and powder for a brown sugar milk smoothie. The question itself seems to contain a choice list that doesn't provide meaningful information without context. Each option lists percentages that sum up to more than 100%, which is not possible. Percent by mass can only total up to 100% since it's a way of describing how much of the total solution is made up of a particular component.