CREATE TABLE table_203_363 (id DECIMAL, "city\ 2010 census" TEXT, "chinese" TEXT, "built-up area" DECIMAL, "urban area" DECIMAL, "level" TEXT, "administrative area" DECIMAL, "province-level division" TEXT, "remarks" TEXT)

how many people live in the built up area of zhengzhou ?
SELECT "built-up area" FROM table_203_363 WHERE "city\n2010 census" = 'zhengzhou'
SELECT "built-up area" FROM "table_203_363" WHERE "city\n2010 census" = 'zhengzhou'