a task can be completed by D and E with in 12 days if they worked together . E and F however can complete with in period of 20 days .
if three of them agree to work together then how many days will be required to complete the task ?
20
40
50
60

• I think there is no correct answer because D and E can complete within 12 days and when F is also ready to work with D and E obviously time required is is less than 12 days.
• 11 years agoHelpfull: Yes(34) No(24)
• Data Insufficient
• 11 years agoHelpfull: Yes(8) No(2)
• Given, D+E --> 12 days and E+F--> 20 days
  Therefore, Total work done = L.C.M. of 12 and 20 = 60
  => Rate of work for D+E = 60/12 = 5 -->equation 1
  Rate of work for E+F = 60/20 = 3 -->equation 2
  
  Now, we'll have to find the rate of work for D+E+F to calculate the no. of days... but how !!!
  Here data is insufficient only 2 equations and 3 variables are there !!!
• 11 years agoHelpfull: Yes(5) No(5)
• data insufficient
• 10 years agoHelpfull: Yes(2) No(0)
• answer is 10 (pprox)...none of above
• 10 years agoHelpfull: Yes(1) No(0)
• dummy question
• 10 years agoHelpfull: Yes(0) No(0)