Answer: They need 34 more days to complete the remainder of the project.
Explanation:
Since we have given that
Number of days the work was done = 6 days
Part of work is completed in these days = 15%
If the work is done at the same rate,
then the remaining part of work is done in how many days.
Remaining part of work is 100% - 15% = 85 %
So, it becomes,

Hence, they need 34 more days to complete the remainder of the project.