CREATE TABLE "average_chart" (
  "rank_by_average" real,
  "place" real,
  "couple" text,
  "total" real,
  "number_of_dances" real,
  "average" real
);

Question: What was the lowest rank by average of a couple who had an average of 23 and a total of 115?
SQL: SELECT MIN("rank_by_average") FROM "average_chart" WHERE "average"=23 AND "total"=115;