CREATE TABLE table_37785 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

What attendance has astros as the opponent, and april 29 as the date?
SELECT SUM("Attendance") FROM table_37785 WHERE "Opponent" = 'astros' AND "Date" = 'april 29'
SELECT SUM("Attendance") FROM "table_37785" WHERE "Date" = 'april 29' AND "Opponent" = 'astros'