Study the given Venn diagram carefully and answer the question. The numbers in different sections indicate the number of persons. (NOTE: You have to take the given data to be true even if they seem to be at variance from commonly known facts.)

How many Pianists are Readers but not Gamers?

The correct option is 20.

To find the number of Pianists who are Readers but not Gamers, we analyze the given Venn diagram by looking at the relationships between the three groups represented by the intersecting circles:
1. Pianists: Represented by the top-left circle.
2. Gamers: Represented by the top-right circle.
3. Readers: Represented by the bottom circle.

We need to identify the region that satisfies all of the following conditions simultaneously:
- It lies inside the circle labeled Pianists.
- It lies inside the circle labeled Readers.
- It lies outside the circle labeled Gamers.

Let's check the numbers in the overlapping sections of the diagram:
- The number 7 lies in the intersection of Pianists and Gamers, but outside Readers.
- The number 6 lies in the intersection of all three circles (Pianists, Gamers, and Readers).
- The number 14 lies in the intersection of Gamers and Readers, but outside Pianists.
- The number 20 lies in the intersection of Pianists and Readers, but outside the Gamers circle.

Therefore, the number of Pianists who are Readers but not Gamers is 20.