CREATE TABLE table_77704 ("Class" TEXT, "W.A." TEXT, "Quantity" FLOAT, "Date" TEXT, "LNER Class" TEXT)

What WA has a LNER Class of n13 and 10?
SELECT "W.A." FROM table_77704 WHERE "Quantity" = '10' AND "LNER Class" = 'n13'
SELECT "W.A." FROM "table_77704" WHERE "LNER Class" = 'n13' AND "Quantity" = '10'