The width of the border will be 0.1648... ft or 1.9786... inches.
<u><em>Explanation</em></u>
Lets assume, the width of the border is ft.
The rectangular garden is 15 ft in length and 7 ft in width. So, the area of the garden
Now, the length of the garden including border and the width of the garden including border
So, the area of the garden including the border
Thus the area of the border
Total amount of premixed cement needed is 1 yard³ = 27 ft³
As the depth of the border is 44 inches or or , so....
Using quadratic formula....
<u>(Negative value ignored)</u>
So, the width of the border