Forward / backward pass question
I'm an old IT guy here. I'm studying very hard but also very new to the PM world.
In my studies, I came across a question that is confusing me.
The question asks "What is the late start of Task E?" Their answer is week 22 but I believe it to be week 21. From my understanding, Task E is on the Critical Path and cannot be delayed.
The attached Excel spreadsheet have, what I believe, are the correct calculations. The JPG is the actual question with their answer explanation. They're adding a day which would push the schedule out a day.
I would appreciate any assistance in helping me understand how my caluclations are incorrect.