Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many viewers have an Air Date of march 20, 2008, and an 18-49 (Rating/Share) of 2.3/7?

### Inputs:
table_name: table, columns: ['Episode', 'Air Date', 'Timeslot', 'Rating', 'Share', '18-49 (Rating/Share)', 'Viewers (m)', 'Rank (Timeslot)', 'Rank (Night)', 'Rank (Overall)']

### Response:
SELECT Viewers (m) FROM table WHERE Air Date = march 20, 2008 AND 18-49 (Rating/Share) = 2.3/7