What is the total enrollment for a private/catholic affiliation and founded after 1842?
CREATE TABLE "membership" (
  "school" text,
  "location" text,
  "founded" real,
  "affiliation" text,
  "enrollment" real,
  "nickname" text,
  "primary_conference" text
);
SELECT COUNT("enrollment") FROM "membership" WHERE "affiliation"='private/catholic' AND "founded">1842;