I want to know the answer to the following question:
How many knights out of ten would be mobilised?
All the background I'm provided with is that "To achieve this, John reformed the English feudal contribution to his campaigns, creating a more flexible system under which only one knight in ten would actually be mobilised, but would be financially supported by the other nine; knights would serve for an indefinite period.". Is that enough to answer the question?
Answer: yes