A man can complete a job in 12 days, wife will complete in 15 days, how many days, working together
(a) 6 2/3 (b) 6 1/3 (c) 10 1/3 (d) 10 2/3

• MAN : 1/12
  WIF : 1/15
  MAN + WIFE : 1/12 + 1/15 =3/20,,,. ie 20/3
  20/3 means 6 2/3
  so ans: 6 2/3
• 12 years agoHelpfull: Yes(11) No(0)
• ANS:(a)
  man's one day work=1/12
  wife's one day work=1/15
  both=(1/12)+(1/15)=9/60
  reciprocal of work is days
  so 60/9=6 2/3 days.
• 12 years agoHelpfull: Yes(1) No(0)
• One day job for a men=1/12
  one day job for a wife=1/15
  so together they can=1/12+1/15=27/180=3/20
  so working together=20/3=6 2/3
• 12 years agoHelpfull: Yes(1) No(0)
• SOLVING BY UNITARY METHOD :
  TOTAL UNITS OF WORK TO BE COMPLETED IS L.C.M OF 12 AND 15 THAT IS 60 UNITS
  MAN COMPLETES 60/12 = 5 UNITS/DAY
  WIFE COMPLETES 60/15 = 4 UNITS/DAY
  TOGETHER IN 1 DAY THEY COMPLETE 9 UNITS/DAY
  SO NUMBER OF DAYS IN WHICH WORK IS COMPLETED IS 60/9 = 6 2/3
• 12 years agoHelpfull: Yes(0) No(0)
• a)6 2/3
  
  man 1 day work 1/12,wife 1 day work 1/15.
  Together (1/12 + 1/15)= 3/20 ( 1 day work ).
  to get total days invert it 20/3= 6 2/3.
• 11 years agoHelpfull: Yes(0) No(0)
• a is answer 1/12+1/15=3/20
  so in 20/3 days they will complete the work
• 7 years agoHelpfull: Yes(0) No(0)
• Number of days taken by the man to complete the job = 12 days
  His wife can complete the same job in = 15 days
  
  productivity = total work ÷ time taken
  total work =60 ( L.C.M of 12 & 15 )
  
  productivity / efficiency of man = = 5 work/ day
  productivity / efficiency of woman = = 4 work / day
  
  hence working together they can complete the job = days
  
  = days
  Ans :- Working together they can complete the job in days.20/3
• 5 Months agoHelpfull: Yes(0) No(0)