CREATE TABLE table_51781 ("Name" TEXT, "Years" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

Can you tell me the total number of Roll that has the Area of aranga?
SELECT COUNT("Roll") FROM table_51781 WHERE "Area" = 'aranga'
SELECT COUNT("Roll") FROM "table_51781" WHERE "Area" = 'aranga'