A and B can complete a work in 12 days,while B and C can complete the same work in 20 days.When working together C leaves the work after 4 days.In how many days can A and B can finish the work.......

• what is the answer for the above unsolved question ?
• 8 years agoHelpfull: Yes(0) No(2)
• a+b=1/12
  b+c=1/20
• 5 years agoHelpfull: Yes(0) No(2)
• here,
  A+B=12
  B+C=20
  
  frist we find the One day work,
  By taking LCM,
  60
  
  B+C=3
  A+B=5
  
  They working together:
  A+B+B+C=8
  A+B+C=4 .............(1)
  
  now,
  
  we know the value of A+B frist day put it in (1)
  5+c=4 hence C=1
  C work together for 4 days so 1X4=4 unit per day C works.
  total unit work 60.
  60 - 4=56
  A+B=5
  the remaining work 56 unit will finished by A+B in 56/5 days i.e 11.2 days
• 5 years agoHelpfull: Yes(0) No(0)