user: Question: Frequency (MHz) that has a Type of primary, and a Call letters of ktbb-fm has what total number?
Columns: ['Frequency (MHz)', 'Call letters', 'Licensed location', 'Type', 'Format']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [88.7, 'KZLO', 'Kilgore', 'Translator of K-LOVE', 'Contemporary Christian']
SQL:

assistant: SELECT COUNT("Frequency (MHz)") FROM "Table" WHERE "Type" = 'primary' AND "Call letters" = 'ktbb-fm';