The task is to generate the correct answer for a given math problem.

[Q]: Problem: a work as fast as b . if b can complete a work in 8 days independently , the number of days in which a and b can together finish the work in ?
[A]: 2 2 / 3 days


[Q]: Problem: a man can do a piece of work in 7 days , but with the help of his son , he can finish it in 3 days . in what time can the son do it alone ?
[A]: 4 1 / 5


[Q]: Problem: the number of sailors on a ship is 78 % more than the number of officers . the ratio of sailors to officers would be
[A]:
89 : 50