Shyam can do a job in 20 days, Ram in 30 days and Singhal in 60 days. If Shyam is helped by Ram and Singhal every 3rd day, how long will it take for them to complete the job?

• 3/20+1/30+1/60
  
  5*3=15
  answer
• 12 years agoHelpfull: Yes(13) No(6)
• Shyam can do 1/20 in one day.
  all three can do 1/10 in one day.
  so 1/20+1/20+1/10+1/20+1/20+1/10+1/20+1/20+1/10+1/20+1/20+1/10+1/20+1/20+1/10=1
  total=15 days to complete.
• 11 years agoHelpfull: Yes(6) No(3)
• together 1 day's work = 1/20+1/30+1/60=1/10;
  1/20(shyam)+1/20 (shyam)+1/10 (all 3) =1/5th of the work in 3 days .thus to complete the wwhole work 5 such sets are needed.thus 3*5=15 days
• 10 years agoHelpfull: Yes(1) No(0)