CREATE TABLE table_52925 ("Class" CLOB, "Wheels" CLOB, "Date" CLOB, "No. built" FLOAT, "Loco Nos." CLOB)

How many were built with a locomotive number of 11-20?
SELECT "No. built" FROM table_52925 WHERE "Loco Nos." = '11-20'
SELECT "No. built" FROM "table_52925" WHERE "Loco Nos." = '11-20'