**How many persons can be accommodated in a big-hall of dimensions 40 m, 25 m and 15 m ; assuming that each person requires 5 m3 of air?**

###### Answers:

[No. of persons = vol. of the hall/vol. of air required for each person]

Length of the hall = 40 m

Breadth of the hall = 25 m

Height of the hall = 15 m

Volume of the hall = L × B × H

= 40 × 25 × 15

= 15000 m^{3}

Volume of the air required for each person = 5 m^{3}

No. of persons who can be accommodated

= volume of the hall/Volume of air required for each person

= 15000 m3/5m3

= 3000