CREATE TABLE table_37642 ("Location  ( State ,  City ) " TEXT, "USN 2013" FLOAT, "BW 2013" FLOAT, "Forbes 2011" FLOAT, "Ec 2013" FLOAT, "FT 2011" FLOAT, "AE 2011" FLOAT, "CNN 2011" FLOAT, "BI 2013" FLOAT, "ARWU 2012" FLOAT)

What is the BW 2013 ranking of Washington, D.C., which has an ARWU 2012 ranking greater than 51?
SELECT "BW 2013" FROM table_37642 WHERE "ARWU 2012" > '51' AND "Location (State, City)" = 'washington, d.c.'
SELECT "BW 2013" FROM "table_37642" WHERE "ARWU 2012" > '51' AND "Location (State, City)" = 'washington, d.c.'