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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.
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No problem.
Well like I was saying before, the result of the operations gives a negative so you must return "No solutions". You have done the code correctly however you need to modify the result of the calculation to check if the chickens or the cows is below 0. I would suggest moving your if loop down and adding on this detail there.
Well the amount of heads is a negative so it should return "No solutions" because you can't have negative animals. If not just copy/paste your code here and I'll check for you :).