I have been trying to formulate this as a transportation problem but I can't seem to do so:
We have $3$ types of projects and $3$ types of evaluators. We need to evaluate $61,40$ and $21$ projects of each type, respectively, and we have $5,3$ and $9$ evaluators of each type. Every evaluator can evaluate $15$ projects, and every project needs to be evaluated twice. Furthermore, the second evaluation must be done by an evaluator of a different type than the first one.
We are given the time each type of evaluator takes to evaluate every type of project, but that is not relevant for the formulation.
I tried to double the projects (so we have 6 destinations), but I don't know how to include that the second evaluator must be different.
Thanks