Question

A can do a job in 12 days and B can do it in 24 days. How many days will they take to finish the job if they work together?​

Answer 1

•Answer :

If A works in 12 days, then A does 1/12th of the work per day.

Similarly, B does 1/24th of the job per day. Let 1/n be the amount, per day, they do together.

Then:

1/12 + 1/24=1/n

2n+n=24

3n=24

n=8

Together, they do 1/8th of the work per day, so they would finish in 8 days.