People in City Park Sections

In a colorful city park, there are three different sections where people can gather: the Picnic area, the Playground, and the Garden. The number of people in each section follows a specific relationship.

The number of people in the Playground is twice the number of people in the Picnic area, while the number of people in the Garden is 5 less than the total number of people in the other two sections combined.

If there are 12 people in the Picnic area, how many people are there in the Garden?