CREATE TABLE table_25787 ("City / Municipality" TEXT, "No. of Barangays" FLOAT, "Area  ( km\\u00b2 ) " TEXT, "Population  ( 2010 Census ) " FLOAT, "Pop. density  ( per km\\u00b2 ) " TEXT)

If the number of barangays is 19, what is the population density?
SELECT "Pop. density (per km\u00b2)" FROM table_25787 WHERE "No. of Barangays" = '19'
SELECT "Pop. density (per km\u00b2)" FROM "table_25787" WHERE "No. of Barangays" = '19'