If one balloon needs 50cm³ of helium to float high enough to touch the ceiling, then the total number of balloons that can float with 1800cm³ of helium is 1800cm³ / 50cm³ = 36 balloons.
Since she bought 50 balloons in total, this means that 50 - 36 = 14 balloons are filled with ordinary air and are not touching the ceiling.
Therefore, there are 36 - 14 = 22 more balloons that are touching the ceiling than not.
#### 22
The answer is: 22
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
While preparing balloons for Eva's birthday party, her mom bought 50 balloons and 1800cm³ of helium. One balloon needs 50cm³ to float high enough to touch the ceiling, and she can fill any remaining balloon with ordinary air. If she used up all of the helium and inflated every balloon, how many more balloons are touching the ceiling than not?

### Answer:
