Question

In a hostel, 100 students had provisions for 130 days. After 10 days ,20 students left the hostel. How long will be remaining food last?

Answer 1

Initial number of students= 100
Initial provision for 130 days
After 10 days remaining provision would last for 130-10= 120 days for 100 students
But number of remaining students is= 100-20= 80
Let remaining provision will last for X days for the remaining students 
Represented as:-
Number of students= 100  80
Number of days      =  120  X
As the number of days will decrease if number of students increase (inverse variation)
Therefore, 100×120= 8×X
Or X= 12000/80= 150 days
Therefore the remaining provision will last for 150 days.

Hope this helps you!! :)

Answer 2

hope this answer is helpful for you..........