Length of hall = 24 m
Breadth of hall = 18 m
Length of carpet = 2.5 m
Breadth of carpet = 80 cm = 0.8 m
Area of hall = Length × Breadth
= 24 × 18
= 432 m2
And, Area of carpet = Length × Breadth
= 2.5 × 0.8
= 2 m2
Number of carpets = (area of hall)/(Area of carpet) = 432/2 = 216
That is, number of carpets are 216.