There were 6 roses in the vase. Mary cut some more roses from her flower garden. There are now 11 roses in the vase. How many roses did she cut ?

Let's denote the number of roses Mary cut from her garden as x . Initially, there were 6 roses in the vase. Mary cut x roses, so the total number of roses in the vase became 6 + x . After cutting some roses, the total number of roses in the vase became 11. Therefore, we can write the equation:

6 + x = 11

To find the value of x , we need to solve this simple equation:

x = 11 - 6

x = 5

Mary cut 5 roses from her flower garden.

\boxed{5}