IBPS Clerk Mains 2018 Paper

Each company start in 2015 and ratio of total employee left BIM in 2015 to that of CNC & DWF together in 2016 is 1 : 2. If total employee who left BIM in 2015 and that of CNC & DWF together in 2016 is 36 and total employee who left CNC in 2016 is 50% of employee who left DWF in same year, then find difference between total employee working in DWF at the end of 2017 and total employee working in BIM at the end of 2016?