Kate, elizabeth and siobhan volunteer at the hospital. in a week, katie volunteers 3 hours more than elizabeth does and siobhan volunteers 1 hour less than elizabeth. over 3 weeks, the number of hours katies volunteers is equal to the sum of elizabeth's and siobhans volunteer hours in 3 weeks. each week, each person works the same number of hours as they did week one complete the table to find out how many hours each person volunteers each week.