Answer:
D. He should add between 2 cups and 3 cups of dirt.
Explanation:
First we need to take the ratio of dirt to peat moss.
8 parts dirt : 3 parts peat moss.
Now we take the ratio and find the value of dirt.
8 : 3 =

x : 1 =


We now multiply both sides by 1.



So now we substitute x.
2.67 Cups Dirt : 1 Cup Peat Moss