CREATE TABLE table_39048 ("Unit" CLOB, "Russian" CLOB, "Translation" CLOB, "Ratio" CLOB, "Cubic inches  ( exact ) " CLOB, "Metric value" CLOB, "Imperial" CLOB, "US Customary" CLOB)

What are the imperial size for the unit that has a ratio of 1/20?
SELECT "Imperial" FROM table_39048 WHERE "Ratio" = '1/20'
SELECT "Imperial" FROM "table_39048" WHERE "Ratio" = '1/20'