Determine the optimum (minimum and maximum) assignment/s for small-scale practical problems by inspection.

A community centre has three volunteers (Volunteer A, Volunteer B, Volunteer C) available to lead three different workshop sessions (Session 1, Session 2, Session 3). The table below shows the skill rating (out of 100) each volunteer has for each session, where a higher rating indicates greater suitability. Determine the optimum assignment of volunteers to sessions that maximises the total skill rating if each volunteer leads exactly one session. Show your working.

A small landscaping business assigns three workers (Maya, Jordan, and Alex) to three different garden renovation projects (North, South, and East). The table below shows the time (in hours) each worker needs to complete each project. Use the table to determine the assignment that minimises the total time required to complete all three projects.