A and B together can do a piece of work in 12 days and A alone can complete the work in 18 days. How long will B alone take to complete the job?
a)30 days
b)36 days
c)6 days
d)56 days

• A's one day work is 1/18
  (A+B)'s one day work is 1/12
  Thus, B's one day work is 1/12-1/18=1/36
  So, B alone can complete the job in 36 days
• 12 years agoHelpfull: Yes(2) No(0)
• a+b=1/12
  a=1/18
  b=?
  (a+b)-a=1/12-1/18=1/36
  b=36
• 9 years agoHelpfull: Yes(1) No(0)
• b)36 days
  (A+B)-A=B's time taken to complete the work
  1/12-(1/18)=1/36
  hence time taken is 36 days
• 12 years agoHelpfull: Yes(0) No(1)
• (A+B)'s 1 day work=1/12
  A's 1 day work=1/18
  (A+B)-A=B
  1/12-1/18=1/36 is B's 1 day work
  B can complete the work in 36 days
• 9 years agoHelpfull: Yes(0) No(0)
• 36 days
  1/12-1/18=1/36
  36 days
  
• 9 years agoHelpfull: Yes(0) No(0)
• 36days
  
  A+B one day's work = 1/18
  A's alone one day's work= 1/12
  Hence B alone one day's work= 1/12 - 1/18
  = 1/36
  36 days
  
• 9 years agoHelpfull: Yes(0) No(0)
• b) 36 days
• 9 years agoHelpfull: Yes(0) No(0)
• the answer is 36 days
  
• 9 years agoHelpfull: Yes(0) No(0)
• A+B= 1/12=3/36
  A' s alone work is 1/18=2/36
  B's alone work is A+B-B= 3/36-2/36
  B s is 1/36
  Work done is 36 days
• 7 years agoHelpfull: Yes(0) No(0)
• 36
  lac 0f 12 and 18=36
  be the total amount of work
  work compete by A and Bin one day 3
  by A=2
  so by B=1
  36/1=36 day
• 7 years agoHelpfull: Yes(0) No(0)
• A+B=12 d
  A=18 d
  take LCM of both we get w=36 units
  hence we can write A+B=36/12 u/d
  =3 u/d --> 1eq
  then,for A=36/18 u/d
  =2 u/d -->2eq
  (1)-(2)
  A+B-A=1 u/d
  B=1 u/d
  hence, in 1 day B can do 1 unit of work, so,
  1 day = 1 unit, hence to do 36 unit of work multiply both side by 36,we get
  36 day = 36 unit
  hence answer is 36 day
• 6 years agoHelpfull: Yes(0) No(0)
• a+b 1 day's work is 1/12
  a's 1day work is 1/18
  1/18+x=1/12
  solving it x= 1/36 that is one day work of b
  so total is 36 days
• 6 years agoHelpfull: Yes(0) No(0)
• A+B=1/12
  B=1/12-1/18=1/36
  therefore 36 days
• 5 years agoHelpfull: Yes(0) No(0)
• B alone is 36days
• 5 years agoHelpfull: Yes(0) No(0)