What is the number of students in Fall 09 from the state that had 3940 in Fall 07?
CREATE TABLE "geography_of_students" (
  "states" text,
  "fall_05" real,
  "fall_06" real,
  "fall_07" real,
  "fall_08" real,
  "fall_09" real
);
SELECT MAX("fall_09") FROM "geography_of_students" WHERE "fall_07"=3940;