Final answer:
The original information required to calculate the number of extra adults Luke needs to pay for a camping trip with 15 youth club campers is incomplete, and without knowing the campground rules or pricing policy, a factual answer cannot be provided.
Step-by-step explanation:
The question pertains to determining the number of extra adults Luke will need to pay for when taking a group of 15 youth club campers, who are all over 14 years old, to a campground. Unfortunately, the original information needed to accurately answer this question regarding the specific campground rules (e.g., at what age individuals are considered 'adults' and how many individuals are allowed per pitch) is missing from the provided context. As such, we cannot determine the number of extra adults Luke needs to pay for without making assumptions or having the complete pricing policy of the campgrounds.
Normally, one would calculate the extra adults based on the requirement of the campgrounds for supervision per a certain number of youth group campers and any base number of adults included in the pitch fee. However, with the current data provided, any answer given would be speculative and non-factual.