CREATE TABLE table_25031 ("Date" TEXT, "Builder" TEXT, "Type" TEXT, "Operator" TEXT, "Number" TEXT, "Withdrawn" TEXT, "Status" TEXT)

List the number for the operator melbourne and metropolitan tramways board.
SELECT "Number" FROM table_25031 WHERE "Operator" = 'Melbourne and Metropolitan Tramways Board'
SELECT "Number" FROM "table_25031" WHERE "Operator" = 'Melbourne and Metropolitan Tramways Board'