CREATE TABLE table_24425491_3 (cover_model VARCHAR)

Who played 20 questions during the issue in which Pamela Horton is on the cover?
SELECT 20 AS _questions FROM table_24425491_3 WHERE cover_model = "Pamela Horton"
SELECT 20 AS "_questions" FROM "table_24425491_3" WHERE "Pamela Horton" = "cover_model"