For this case we have:
Block 4-12: Represent 9 remaining blocks.
If in each one there are three weeks of work then we have:
[tex]9 * 3 = 27[/tex]
27 weeks of work.
Now, if a week is done in a day we have:
[tex]27 * 1 = 27[/tex]
27 days
It will take 27 days to finish.
ANswer:
27 days
