CREATE TABLE table_9185 ("% people under 18  ( 2005 ) " TEXT, "Seine-Saint-Denis" TEXT, "Paris" TEXT, "Val-de-Marne" TEXT, "Val-d'Oise" TEXT, "France" TEXT)

WHAT IS THE VAL-DE-MARNE WITH A Seine-Saint-Denis of 2.7%?
SELECT "Val-de-Marne" FROM table_9185 WHERE "Seine-Saint-Denis" = '2.7%'
SELECT "Val-de-Marne" FROM "table_9185" WHERE "Seine-Saint-Denis" = '2.7%'