how many places have 17 varsity teams?
CREATE TABLE "members" (
  "school" text,
  "mascot" text,
  "location" text,
  "founded" real,
  "entered_isl" real,
  "grades" text,
  "number_of_students" text,
  "varsity_teams" real
);
SELECT COUNT("location") FROM "members" WHERE "varsity_teams"=17;