Ram completes 60% of a task in 15 days and then takes the help of Rahim and Rachel. Rahim is 50% as efficient as Ram is and Rachel is 50% as efficient as Rahim is. In how many more days will they complete the work?

• ram completes 60% of work in 15 days
  so ram 1 day work is 60% / 15= 4%
  rahim is 50%efficient than ram
  so rahim 1 day work is 2%
  rachel is 50% efficient than rahim
  so rachil 1day work is 1%
  total work done by ram rahim and rachel in 1 day is 4%+2%+1%= 7%
  7%----- 1 day
  40%---------?
  40/7
  so 5.7=6 days needed to complete the 40%of work
• 11 years agoHelpfull: Yes(15) No(1)
• 5(5/7) days they will complete the work.
  
  Ram completes 60% of the task in 15 days.
  i.e., he completes 4% of the task in a day.
  
  Rahim is 50% as efficient as Ram is.
  i.e., Rahim will complete 2% of the task in a day.
  
  Rachel is 50% as efficient as Rahim is
  i.e., Rachel will complete 1% of the task in a day.
  
  Together, Ram, Rahim and Rachel will complete 4 + 2 + 1 = 7% of work per day.
  They have another 40% of the task to be completed.
  Therefore, they will take 40/7 more days to complete the task.
  i.e., 5(5/7) days.
• 12 years agoHelpfull: Yes(5) No(0)