UP Police SI Exam 12 Dec 2017 Shift 1 Solved Paper

A contract is to be completed in 92 days. 260 people of equal efficiency were employed, with each working 16 hours per day. After 66 days, it was found that 4/7 of the work was completed. How many additional persons with the same efficiency of those already working should be deployed so that the work is completed on time, if each person now works for 18 hours per day?