CREATE TABLE table_39049 ("Unit" CLOB, "Russian" CLOB, "Translation" CLOB, "Ratio" CLOB, "Cubic inches  ( exact ) " CLOB, "Metric value" CLOB, "Imperial" CLOB, "US Customary" CLOB)

How big in metric terms is the unit that has a ratio of 1/20?
SELECT "Metric value" FROM table_39049 WHERE "Ratio" = '1/20'
SELECT "Metric value" FROM "table_39049" WHERE "Ratio" = '1/20'