A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?

Options
1) 60
2) 50
3) 40
4) 30

• 20(1/30)+20/a=1
  a=60
• 8 years agoHelpfull: Yes(12) No(0)
• if A+B do the work in 1 days 1/30
  then in 20 days 20/30
  remaining work is 1/3
  now let A completes the work in x days
  so work done by A in one day is 1/x
  so in 20 days 20/x=1/3
  so the x=60
  ans is 60
  
• 8 years agoHelpfull: Yes(5) No(0)
• 60 is the right anwser
  please use basic approach to slove this question
• 8 years agoHelpfull: Yes(1) No(0)
• 60
  ................
• 8 years agoHelpfull: Yes(1) No(0)
• A+B=1/30
  A+B=20/30 FOR 20 DAYS
  Remaining work =1/3
  1/3 work is cmplted by A is 20 days
  cmplt wrk is in 60 days by A
• 8 years agoHelpfull: Yes(0) No(0)
• A and B can do work in 30 days
  so 1 days both will be work 1/30
  so 20 days both will be work 20/30
  so work left is 1-(20/30)=10/30 work done by A IN 20 DAYS so A can finish the work (30*20)/10
  = 60 days
  
• 8 years agoHelpfull: Yes(0) No(0)
• 60
  better to solve through option
• 7 years agoHelpfull: Yes(0) No(0)
• A+B in 60 days
  A+B worked for 20 days hence 66.6% work complete.
  B left
  A did remaining 33.3% work in 20 days. Hence capacities are same hence individually both can take 60 days to complete
• 7 years agoHelpfull: Yes(0) No(0)