How can percentages be formulated in a reverse question?

Formulating percentages in a reverse question involves asking for the original total when a percentage of that total is known. In this context, option A is the most appropriate choice because it accurately reflects a situation where you have a percentage (for example, 20% of a total) and need to determine what the original total amount is.

For instance, if it's stated that 20% of a certain amount is 50, the question can be reframed to ask, "What is the total amount?" This matches the logic of working backwards from the percentage to find the full amount.

The other options do not fit this formulation. Comparing two fractions does not directly address how to derive a total from a given percentage. Stating "What is 40?" is too vague and does not present a clear percentage context. Using only whole numbers is unrelated to the specific process of reverse percentage calculations, as percentages can apply to both whole and non-whole numbers.