Ava has 55 quarts of potting mix. She uses

1
4
of the potting mix in the wall planter on her balcony. She uses the rest of the soil at the community garden in her neighborhood. How much potting mix does Ava use at the community garden?

Ava uses 55/4 = <<55/4=13.75>>13.75 quarts of potting mix in the wall planter.

Ava uses 55 - 13.75 = <<55-13.75=41.25>>41.25 quarts of potting mix at the community garden. Answer: \boxed{41.25}.

To determine how much potting mix Ava uses at the community garden, we need to find the difference between the total amount she has (55 quarts) and the amount she uses in the wall planter.

Step 1: Calculate the amount of potting mix Ava uses in the wall planter
The fraction of potting mix used in the wall planter is 1/4.
So, the amount Ava uses in the wall planter is:
55 quarts * (1/4) = 55/4 = 13.75 quarts

Step 2: Calculate the amount of potting mix used at the community garden
To find out how much potting mix Ava uses at the community garden, subtract the amount used in the wall planter from the total amount she has:
55 quarts - 13.75 quarts = 41.25 quarts

Therefore, Ava uses 41.25 quarts of potting mix at the community garden.