Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Episode | Air Date | Timeslot | Rating | Share | 18-49 (Rating/Share) | Viewers (m) | Rank (Timeslot) | Rank (Night) | Rank (Overall) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| "Homecoming" | March 18, 2008 | 10:35 P.M. | 6.7 | 12.0 | 2.9/8 | 9.93 | 1.0 | 5 | 21.0 |
| "Hot Sub" | March 20, 2008 | 8:00 P.M. | 4.2 | 8.0 | 2.1/7 | 6.28 | 4.0 | 9 | 49.0 |
| "The List" | March 20, 2008 | 8:30 P.M. | 4.3 | 7.0 | 2.3/7 | 6.31 | 4.0 | 9 | 47.0 |
| "Rebel Yell" | March 27, 2008 | 8:00 P.M. | 4.0 | 7.0 | 2.0/6 | 5.9 | 4.0 | 7 | 59.0 |
| "Pool Party" | March 27, 2008 | 8:30 P.M. | 3.8 | 6.0 | 2.1/6 | 5.58 | 4.0 | 8 | 65.0 |
| "High School Musical" | April 3, 2008 | 8:00 P.M. | 3.2 | 5.0 | 1.5/5 | 4.6 | 4.0 | N/A | 70.0 |
| "Frenemies" | April 3, 2008 | 8:30 P.M. | 3.0 | 5.0 | 1.6/4 | 4.34 | 4.0 | N/A | 74.0 |
Question:
How many viewers have an Air Date of march 20, 2008, and an 18-49 (Rating/Share) of 2.3/7?
Answer:
6.31