CREATE TABLE table_1715 ("COMPANY NAME" TEXT, "Holding Companies" FLOAT, "Subsidiaries" FLOAT, "Description of activities" TEXT, "Parent  ( holding )  company" TEXT)

How many subsidiaries of Postermobile Limited?
SELECT "Subsidiaries" FROM table_1715 WHERE "COMPANY NAME" = 'POSTERMOBILE LIMITED'
SELECT "Subsidiaries" FROM "table_1715" WHERE "COMPANY NAME" = 'POSTERMOBILE LIMITED'