CREATE TABLE table_68630 ("Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

Name the least silver for nation of total when bronze is more than 24
SELECT MIN("Silver") FROM table_68630 WHERE "Nation" = 'total' AND "Bronze" > '24'
SELECT MIN("Silver") FROM "table_68630" WHERE "Bronze" > '24' AND "Nation" = 'total'