Question

A and B can do some work together in 8 days, which A can do on his own in 12 days. How many days will B take to do the work alone

Answer 1

A and B can do a work in 8 days

so they can do 1/8 part of work in a day

A .can do it in 12 days

so A can do 1/12 part of work in a day

Let the time taken by B be x

1/8 = 1/12 + 1/x

1/x = 1/8 - 1/12

1/x =4/96

1/x = 1/24

x = 24

so be cam do same work in 24 days alone

Answer 2

Let a one day work be 1/12 and together work be 1/12 let bs work be 1/x
Therefore 1/12 + 1/x = 1/8
1/x = 1/8 - 1/12
1/x = 3-2/24
1/x = 1/24
x = 24 days