= 210 students - 50 days (provision left after 10 days)
60 student leaves
Student left - 150 Days - D
so 210 x 50 = 150 x D
D= 70 days
There are 100 students in a hostel. Food provision for them is for 20 days. How long will these provisions last, if 25 more students join the group?
A hostel has ration for 60 days for 500 students. After 12 days 300 more students joins the hostel. How long will the same ration last?