ICSE Board: Suggested Books     ICSE Board:  Foundation Mathematics
Class 8: Reference Books               Class 8: NTSE Preparation
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Rules for Solving the Problems based on Time and Work

1) If a person can complete a work in n days, then in 1 day he does nth of the work. We have

A\ Person's \ 1\ Day\ Work=\frac{1}{Total\ number\ of\ days\ he\ requires\ to\ complete\ the\ work}

 

2) If a person completes of a work in 1 day, then he requires n number of days to complete the work

Total\ number\ of\ days\ he\ requires\ to\ complete\ the\ work=\frac{1}{A \ Person's \ 1\ Day\ Work}

 

3) If part of the work has been done and the remaining part of the work has to be done by a person A, then

Number\ of\ days\ required\ to\ complete\ the\ work=\frac{Remaining\ Part\ of\ the\ Work}{A's\ 1\ Day\ Work}

 

4) If A\ is\ m times as good ·a workman as B , then

  • i) Ratio of work done by A \ and\  B in the same time = m : 1
  • ii) Ratio of time taken by A \ and\  B to finish the work =1: m

 

5) If some persons work together to do a piece of work, then the money paid to them is divided among them in the ratio of their one day’s (or one hour’s) work.

 

ICSE Board: Suggested Books     ICSE Board:  Foundation Mathematics
Class 8: Reference Books               Class 8: NTSE Preparation
--------------------------------------------------------------

 

 

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