A hostel spends Rs.3200 as cost of rice for 20 students for 30 days.If they spend Rs.2400 for 30 students,for how many days will the rice last?
Rs 3200 for 20 students for 30 days
So Rs per student per day
Rs 2400 for 30 students. Let the number of days it will last be x
The per student per day cost should remain same
so
so x = 15 days