A and B can together complete a piece of work in 4 days. If A alone can complete the same
work in 12 days, in how many days can B alone complete that work ?
a)4 days
b)5 days
c)6 days
d)7 days

• let us assume that B can complete the work in x days...
  so B work 1/x in 1 day
  A can work 1/12 in 1 day
  so together they work 1/12+1/x in 1 day
  which according to the question is 1/4
  
  so 1/12+1/x= 1/4
  1/x = 1/6
  so x= 6
  so B alone can complete the work in 6 Days.
  so the correct option is C.
• 10 years agoHelpfull: Yes(22) No(0)
• (a+b)'s one day work is 1/4
  a's one day work is 1/12
  b's one day work is (1/4)-(1/12)=1/6
  b alone can complete the work in 6 days
  
• 10 years agoHelpfull: Yes(4) No(0)
• given a+b can do in 4 days do 1 day work of a+b is 1/4
  and also given a can complete the work in 12 days so a's 1 day work alone is 1/12
  no on solving the equation:
  1/12+b=1/4 (since a=1/12)
  b=1/4-1/12
  b=3-1/12
  b=2/12
  b=1/6
  so b's 1 day work is 6 total work can be done in 6 days
  
• 10 years agoHelpfull: Yes(1) No(0)
• work done by a and b in one day =1/4
  work done by a in one day= 1/12
  then work done by b= 1/4 - 1/12 =1/6
  the work is completed by b in 6 days
• 9 years agoHelpfull: Yes(1) No(0)
• c> 6 days
  
• 10 years agoHelpfull: Yes(0) No(1)
• c) 6 days
  
• 10 years agoHelpfull: Yes(0) No(0)
• 1/a+1/b=1/4
  1/12+1/b=1/4
  => 1/b=1/6
  
• 10 years agoHelpfull: Yes(0) No(0)
• here 1/A+1/B=1/4
  1/A=1/12(GIVEN);HENCE1/B=1/4-1/12=1/6
  HENCE B can complete the work in 6 days
• 10 years agoHelpfull: Yes(0) No(0)
• A can do a piece of work in 12 days.
  A+B=4DAYS
  LCM of two number is 12.
  work is assume that they have to eat 12 chocs.
  A and B will eat 3 chocs per day.
  A will eat 1 chocs per day.
  so b need to eat 2 chocs per day.by this we can conclude that
  B takes 6 days to complete the work.
• 9 years agoHelpfull: Yes(0) No(0)
• A+B does 1/4th work in 1 day
  A does 1/12th work in 1 day
  B will do ((1/4)-(1/12))ie. 1/6th work in 1 day
  B will take 6 days to complete the work.
• 9 years agoHelpfull: Yes(0) No(0)
• A & B together can do the part of work in 1 day=1/4
  A alone can do the part of work in 1 day=1/12
  Thus, B can do the part of work alone in 1day=1/4-1/12=1/6
  
  Thus, B alone can complete that work in 6days.
• 9 years agoHelpfull: Yes(0) No(0)
• HERE A AND B CAN DO THEIR WORK IN 4 DAYS. A ALONE CAN DO IT IN 12 DAYS.
  SO A AND B CAN DO 1/4 WORK IN 1 DAY. SO A CAN DO 1/12 WORK IN 1 DAY.
  SO B CAN DO (1/4-1/12)= 1/6 IN 1 DAY. SO B ALONE CAN DO THE WORK IN 6 DAYS.
  
• 9 years agoHelpfull: Yes(0) No(0)
• formula x*y/x-y
  12*4/12-4=6days
• 9 years agoHelpfull: Yes(0) No(0)
• A+B=1/4
  A=1/12
  1/12+B=1/4
  B=1/4-1/12
  B=(12-4)/48
  B=8/48
  B=1/6
  B=6days
• 4 years agoHelpfull: Yes(0) No(0)