Question

in a hostel of 70 boys, there are food provisions for 40 days . If 10 more boys join the hostel , how long will these provisions last?

Answer 1

70*40 = 80* x, where x is the number of days after the 10 more boys join
x = 35 
therefore provisions will last for 35 days 

Answer 2

Below in the image you can see the answer