Question: WHat is the number of Population has a Density of 50.09 and a Rank larger than 30?
SQL: SELECT SUM("Population") FROM "2-15707829-1" WHERE "Density" = 50.09 AND "Rank" > 30.0;

Question: What is the Density that has a Population larger than 290458, and an Area of 91.6?
SQL: SELECT SUM("Density") FROM "2-15707829-1" WHERE "Population" > 290458.0 AND "Area" = 91.6;