user: Question: What is the lowest wk 3 value with an n/r in wk 14, a wk 2 value of 7, and a wk 11 value greater than 18?
Columns: ['Poll', 'Wk 2', 'Wk 3', 'Wk 4', 'Wk 5', 'Wk 6', 'Wk 7', 'Wk 8', 'Wk 9', 'Wk 10', 'Wk 11', 'Wk 12', 'Wk 13', 'Wk 14', 'Final']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'text', 'text', 'text']
Sample row: ["USA Today/ESPN Coaches' Poll (Top 25)", 11.0, 12.0, 8.0, 13.0, 8.0, 17.0, 14.0, 13.0, 17.0, 14.0, 13.0, '21', '22', 'N/R']
SQL:

assistant: SELECT MIN("Wk 3") FROM "Table" WHERE "Wk 14" = 'n/r' AND "Wk 2" = 7.0 AND "Wk 11" > 18.0;