Question

A woman completes 2/7th of her job in 5 days. At this rate, how many more days will she take to finish the job?
15.5 days
12.5 days
10 days
16 days

Answer 1

2/7 th of  a job  in  5 days.

so 7 * 2/7  th of a job in  7 * 5 days.
ie..  two times the job in  35 days.

so  the job is done in  35/2 = 17.5 days.

Already  5 days she spent in doing 2/7 of job.  So she will need  12.5  more days.