CREATE TABLE table_73194 ("LMS No." FLOAT, "WD No." FLOAT, "Builder" TEXT, "Serial No." FLOAT, "Date built" FLOAT)

Name the total number of wd number for lms number being 7638
SELECT COUNT("WD No.") FROM table_73194 WHERE "LMS No." = '7638'
SELECT COUNT("WD No.") FROM "table_73194" WHERE "LMS No." = '7638'