Question

A hostel has enough food for 120 students for 30 days how long the food lasts if 30 students left the h

Answer 1

Answer:

120 students has food for 30 days.

1 student has food for 30 ×120

30 students left.

120-30 = 90 students has food for (30×120)/90

==>40 days

Answer 2

Answer:

When 120 students are there in the hostel the food lasts for 30 days.

When 30 students leave the hostel the no of students are 120-30=90

So we have to find the no of days the food will last for 90 students

We can do this by inverse proportion

X. 120. 90

Y. 30. y

xy=k

120*30 = 90y

3600 = 90y

3600/90 =y

40 = y

The no of days the food will last is 40 days