Question

How many tiles, each of area 625 cm², will be needed to pave a footpath which is 1 m wide and surrounds a grass plot of size 38 m x 14 m?

Answer 1

Area of grassy plot
= 38 x 14
= 532m²
Length of a grass plot with footpath = 38 + 2 = 40m
Width of a grass plot with footpath = 14 + 2 = 16m
∴ Area of the grass plot with footpath = 40 x 16 = 640m²
 Area of the footpath  = Area of the grass plot with footpath - Area of grassy plot
= (640 - 532)m²
= 180m²
= 1080000m²
Area of each title = 625cm²
∴ Number of titles

= `"Area of the footpath"/"Area of each title"`

= `(1080000)/(625)`
= 1728.