Avinash takes 15 days to complete a work and Bada takes 12 days to
complete the same work. If they work in alternate days, In how many
days they finish the work.
A. 13 days B. 13 1/4 days C. 6 1/4 days D. None

• b)13(1/4)days
  
  Avinash does 1/15 work in a day
  Bada does 1/12 in a day
  In 2 days: they do 1/15 + 1/12 = 9/60 of the work
  
  Now 9/60 * 6 = 9/10 of the work is done in 12 days.
  Remaining 1/10 of the work needs to be done.
  13th day 1/12 of the work is done by B and 1/10-1/12 = 1/60 of the work remains which is then done by A in (1/60) / (1/15) = 1/4 th of a day.
  
  therfore the ans is 13 1/4 days.
• 12 years agoHelpfull: Yes(10) No(5)
• LCM(15,12)=60
  Avinash's per day efficiency=60/15=4
  Badal's per day efficiency=60/12=5
  now acc. to the question they work alternate days
  so sequence will be,4+5+4=13
  or another sequence will be,5+4+5=14
  but in option 13 is given so ans is 13
• 7 years agoHelpfull: Yes(1) No(5)
• Ans willbe 13 1/4 only when bada starts work on first day and avinash starts work on 2nd day ........alternatively
• 6 years agoHelpfull: Yes(0) No(0)