In a hostel of 50 students there is food for 40 days. If 30 more students join the hostel then how long will the food last? 23 days 20 days 25 days 30 days

Answer: 25 days

Step-by-step explanation:

The original number of students in the hostel was 50, and now it is 80 because 30 joined. So the original number of students was 5/8 of what it is now.

I use the inverse formula the number of days the food will last.

40 * 5/8 = 200/8 = 25

If there are 80 students, then the food will only last for 25 days.