CREATE TABLE table_64639 ("Name" TEXT, "LWAT" FLOAT, "100+" FLOAT, "140+" FLOAT, "180s" FLOAT)

What's the 100+ when the 140+ is less than 128 and the LWAT of 29?
SELECT SUM("100+") FROM table_64639 WHERE "LWAT" = '29' AND "140+" < '128'
SELECT SUM("100+") FROM "table_64639" WHERE "140+" < '128' AND "LWAT" = '29'