CREATE TABLE table_27334 ("Episode No." TEXT, "Prod No." FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original UK airdate" TEXT)

When don inglis and ralph smart are the writers how many episode numbers are there?
SELECT COUNT("Episode No.") FROM table_27334 WHERE "Written by" = 'Don Inglis and Ralph Smart'
SELECT COUNT("Episode No.") FROM "table_27334" WHERE "Written by" = 'Don Inglis and Ralph Smart'