Question 843510
45*100=4500 man days for 2.5 km
The road will take 15/2.5=6  times 100=600 total days  to finish or 500 more days
There is already 2.5 finished so for 12.5 km  12.5/2.5=5
so he needs 4500*5 man days.  22500 man days/200 =112.5 men to finish the job in 200 more days.
We can't just hire a half a man so we will need 113 men total 113-45=68 more men.