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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The code is solid but I can't help myself asking why the younger person's age was named "average" given that it's not the average of any numbers in this problem.