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Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in

Correct Answer: 3 days

Explanation:

Let x men can do the in 12 days and the required number of days be z


 


More men, Less days     [Indirect Proportion]


 


Less work, Less days     [Direct Proportion  ]


  m e n 2 x : x w o r k 1 : 1 2   : :   12   :   z


2 x × 1 × z = x × 1 2 × 12


  z = 3


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