Answer:
3 bags are needed to cover this flower bed
Step-by-step explanation:
Use conversion:
1 yard = 3 feet
Area of a triangle(A) is given by:

where,
b is the base and h is the height of the triangle.
As per the statement:
From the given diagram:
Base(b) = 3 yards = 9 feet
Height(h) = 2 yard = 6 feet
then;
square feet.
Since, it is given that if one bag of topsoil covers 10 square feet
⇒10 square feet = 1 bag
then\;
in 27 square feet =
bag
Therefore, 3 bags are needed to cover this flower bed