CREATE TABLE table_79738 ("Number" FLOAT, "Builder" TEXT, "Built" TEXT, "Rebuilt" TEXT, "Name as rebuilt" TEXT, "Scrapped/Sold" TEXT)

Which Scrapped/Sold has a Builder of derby, and a Name as rebuilt of ben madigan?
SELECT "Scrapped/Sold" FROM table_79738 WHERE "Builder" = 'derby' AND "Name as rebuilt" = 'ben madigan'
SELECT "Scrapped/Sold" FROM "table_79738" WHERE "Builder" = 'derby' AND "Name as rebuilt" = 'ben madigan'