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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.
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If you have 100kg water and remove 50kg water, you don't go from 100% water to 50% water, you go from 100% water to 100% water.
It does not say that 1kg of water was removed. It does say that 50kg of water was removed, and that it now consists of 98% water.