arithmetic - in a company 200 persons working 6 hours per day complete 13 rd of the work in 7 days employee number of additional persons working 4 hrs per day required to complete the remaining work in 15 days is - skillgun

Solution: Let the number of persons completing the work in 15 days be x.
Work done = 1/3, remaining work = (1-1/3) = 2/3.
less hours per day, more men required (IP)
more work, more men required (DP)
more days, less men required (IP)
hours per day 4 : 6
work 1/3 : 2/3 } : : 200 : x
days 15 : 7
.'. 4*1/3 * 15*x = 6 * 2/3 * 7 * 200
=> 60x = 16800
=> x = 16800/60 = 280.
Additional men required = (280-200) = 80.