Một phân xưởng dự định làm một số sản phẩm trong một thời gian nhất định với năng suất 40 sản phẩm/ngày. Trong thực tế do có một số vấn đề kĩ thuật còn bị trục trặc, nên mỗi ngày phân xưởng chỉ làm đượ...

To solve this problem, we can use the concept of "work done" and "time taken". Let's denote the number of products planned to be made as $$. The work done by the factory at the planned productivity is given by $$, and at the actual productivity, it is given by $$ (since they take 1 extra day to finish). According to the problem, the work done should be equal. Therefore, we have the equation: $$ Solving for $$, we get: $$ $$ $$ So, the number of products planned to be made is 3. However, since they are behind schedule by one day, they need to make up for the shortfall. The additional products needed can be calculated as: $$ Hence, the number of additional products needed is -20. This means that they are actually overproducing by 20 units compared to their original plan.