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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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Probably tests are poorly written as you said. You can simply use a float for the dividend to get a decimal number instead of a ratio.
I propose the solution
Looks like the tests don't cover that.