CREATE TABLE table_10095 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

When the Away team scored 20.15 (135) on the Date of 23 april 1973, how many people were in the crowd?
SELECT "Crowd" FROM table_10095 WHERE "Date" = '23 april 1973' AND "Away team score" = '20.15 (135)'
SELECT "Crowd" FROM "table_10095" WHERE "Away team score" = '20.15 (135)' AND "Date" = '23 april 1973'