Many spreadsheet models are straightforward, successful adaptations of classic forms, such as transportation, blending, multi-period inventory, and portfolio-optimization problems.
(Many spreadsheet models; are; straightforward, successful adaptations of classic forms, such as transportation, blending, multi-period inventory, and portfolio-optimization problems)
Many spreadsheet models
are
straightforward, successful adaptations of classic forms, such as transportation, blending, multi-period inventory, and portfolio-optimization problems