Aptitude -Time and Work Formulas

  1. Work from Days:
    If A can do a piece of work in n days, then A’s 1 day’s work = 1 .
  2. Days from Work:
    If A’s 1 day’s work = 1 , then A can finish the work in n days.
  3. Ratio:If A is thrice as good a workman as B, then:Ratio of work done by A and B = 3 : 1.Ratio of times taken by A and B to finish a work = 1 : 3.


  1. have completed my test.sir/mam pseale recheck the ans of foll ques sec4 ques no 1,4,5.sec 6-ques 4.and also plz tell me how we calculate the ans of ques 2 of sec 5.thanx very good collection.plz look again that questions.

  2. Muthu Krishnan says:

    Very Useful Link.

  3. dsajdkskad

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three + = 4