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प्रश्न
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?
उत्तर
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.
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