Adam can do a job in 15days, John can do the same job in 20days. If they work together for 4days on this job. What fractionof job is incomplete ? Options:
A) 3/11	B) 4/11	C) 13/13	D) 8/15	E) 9/11
Adam can do 1/15 of the job per day   John can do 1/20 of the job per day   If they work together they can do 7/60 of the work together   Remaining job 1 - 4*7/60 = 32/60 = 8/15   (8/15)
<result>D</result>
Adam can do a job in 15days, John can do the same job in 20days. If they work together for 4days on this job. What fractionof job is incomplete ?