CREATE TABLE table_20787 ("product" TEXT, "dimensions  ( mm ) " TEXT, "dpi" FLOAT, "pages per minute  ( color ) " FLOAT, "max page size" TEXT, "interface" TEXT)

What is the dpi of a scanner with the mm dimensions 280 x 95 x 40?
SELECT "dpi" FROM table_20787 WHERE "dimensions (mm)" = '280 x 95 x 40'
SELECT "dpi" FROM "table_20787" WHERE "dimensions (mm)" = '280 x 95 x 40'