What is the dpi for the scanner with a max page size of 216mm x 355mm?
CREATE TABLE "typical_duplex_scanners" (
  "product" text,
  "dimensions_mm" text,
  "dpi" real,
  "pages_per_minute_color" real,
  "max_page_size" text,
  "interface" text
);
SELECT "dpi" FROM "typical_duplex_scanners" WHERE "max_page_size"='216mm x 355mm';