Pearl coordinates volunteers to help collect and sort donations at the food bank on Mondays, Wednesdays, and Fridays. Of her volunteers, \(50\%\) are available on Mondays, \(80\%\) are available on Wednesdays, and \(90\%\) are available on Fridays. A total of \(18\) volunteers are available on all three days, and all other volunteers are available on exactly two of the three days. How many volunteers are there in total?