Answer
Number of Bags Needed$: 4.83~bags\approx5~bags$
Work Step by Step
To find the number of bags needed, we need to first find the area of the shaded corner.
The formula for the area of the triangle is:
$A=\frac{bh}{2}$
where the lengths are:
$b=20ft$
$h=36ft$
So, we have the corner area:
$A=\frac{(20ft)(36ft)}{2}=360 ft^{2}$
The number of bags is the total area divided by the amount of space one bag covers.
Thus, we have:
$bags=\frac{A}{75ft^{2}}=\frac{360ft^{2}}{75ft^{2}}=4.83~ bags\approx5~bags$
