Answer:
B. Three bags
Step-by-step explanation:
For this problem you want to first find the area of the triangle so let's use the formula: 1/2*b*h. We can see in the picture that your base is 20m and your height is 6m so let's plug in your values to the equation and you'll get 1/2*6*20. Let's then multiply and we'll get 60.
The problem then states that one bag of topsoil is 20 square meters while our area of the triangle is 60sq. meters. Divide, 60/20=3 therefore you will need 3 bags of top soil for the entire triangular flower bed.
