The question said there was  in equity I just used it Whoever wrote the problem did something which made no sense  He took All the Risk Weighted Assets then took out the liabilities  Imagine I had  in cash and  in liabilities Lets say the cash had no risk Then according to you I have negative equity Because the person that did it took Risk Weighted Assets IE  and minused liabilities IE  so the sum    I did it correctly Its Equity or capital divided by RWA