Final answer:
Based on the given information, none of the four girls is learning the most difficult pair of languages.
Step-by-step explanation:
Based on the given information, we can determine the difficulty level of each language. The easiest language is Spanish, followed by French, Dutch, and Chinese. To find out which girl is learning the most difficult pair of languages, we need to compare the difficulty levels of the language pairs they are learning.
Girl P is learning French and Dutch. Girl Q is learning Chinese and Japanese. Girl R is learning Spanish and French. Girl S is learning Dutch and Japanese.
Comparing the pairs:
- French and Dutch (P): French is easier than Dutch, so this pair is not the most difficult.
- Chinese and Japanese (Q): Chinese is harder than Japanese, so this pair is not the most difficult.
- Spanish and French (R): Spanish is easier than French, so this pair is not the most difficult.
- Dutch and Japanese (S): Dutch is easier than Japanese, so this pair is not the most difficult.
Therefore, none of the four girls is learning the most difficult pair of languages. If we had to choose, girl Q learning Chinese and Japanese would be learning the most difficult pair of languages based on the given information.