Total 5 bottles will be required to treat a garden of perimeter 105 ft.
Perimeter is the sum of all the outer dimensions of a figure.
The distance a person has to travel to go one round the figure is the perimeter.
A flower garden is shown in the figure attached
The dimensions of the garden is
4ft , 18ft, 15ft , 5ft
The perimeter of the figure = 4+18+15+5 = 42 ft
Two bottles of fertiliser is needed to treat the flower garden of 42 ft
For a garden of 108 ft , the number of bottle required will be
= 105 *2 / 42
= 5 bottle
Therefore , 5 bottles will be required to treat a garden of perimeter 105 ft.
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