What is the total number of Opponents, when Raiders Points is "42", when Attendance is less than 52,505?
CREATE TABLE "schedule" (
  "game" real,
  "date" text,
  "opponent" text,
  "result" text,
  "raiders_points" real,
  "opponents" real,
  "raiders_first_downs" real,
  "record" text,
  "attendance" real
);
SELECT COUNT("opponents") FROM "schedule" WHERE "raiders_points"=42 AND "attendance"<'52,505';