1.If X completes a work in x days, then work done by X in one day
is 1/x.
2. If work done by X in one day is 1/x, then time taken by X to complete the work is x days.
3. If If X completes a work in x days and Y completes a work in y days, then the work done by them working together in one day is 1/x + 1/y and time taken by both to complete the work together is xy/(x+y) days.
4. Number of days required to complete the given work = Total work to be done/Work done in one day.
5. N1H1D1E1W2 =
N2H2D2E2W1
Where:
N1 and N2 = number of person
H1 and H2 = Hours worked by
per person per day (assumed constant)
D1 and D2 = days
E1 and E2 = Efficiency
W1 and W2= Amount of work done
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