Answer: In 260 more Days the work will be completed!
Explanation:
120 Men can finish the work in 200 Days, the Work Load is 24000 120*200 Man days.
The Work Load is 24000 - 600 = 23400 Man days
Therefore since 30 men are left the job the workforce available is 120 - 30 = 90 Men
The days to finish the work is 23400 / 90 = 260 Days.
Which means 260 more days the work will be completed :)
