Q. A and B can together do a work in 6 days. A can do it alone in 9 days. In how many days can B do it alone?

A) 21 days

B) 24 days

C) 18 days

D) 14 days

✔ 18 days

Additional Information > Exam point of View

Given,
A and B both's one day's work =1/6

A's alone's one day's work =1/9

∴ B's alone one day's work \=1/6−1/9

=(3−2)/18=1/18

Invert value than : 18/1=18 days

∴ B can finish the work in 18 days