arithmetic - pushpa and getha together can complete a work in 6 days pushpa alone can complete it in 10 days if getha does the work only for half a daily then in how many days pushpa and getha together will complete the work - skillgun

Solution: Let P = Pushpa, Q = Getha.
Q's 1 day's work = (1/6 - 1/10) = 1/15.
now, (P+Q)'s 1 day's work = (1/10 + 1/2(1/15)) = 4/30 ('.' Q works for half day only)
So, Pushpa and Getha together will complete the work in 30/4 = 7.5 days.