A, B and C can finish a piece of work in 20,30 and 40
days respectively. They started the work together and
A leaves the work after 5 days. C leaves 10 days before
completion of the work. In how many days would whole
work have been finished?
Let when all they work together can finsh work in x days.
A can finish work in 1 day =(1/20) work
so in 5 days he will finish = (5/20) work
B can finsh wiork in 1 day= 1/30 work
so he can finsh work in x days= (x/30) work
C can finish work in 1 day =(1/40) work
so in (x-10) days he can finish= (x-10)/40 work