CREATE TABLE table_12404 ("Place" FLOAT, "Nation" TEXT, "First Exercise" FLOAT, "Second Exercise" FLOAT, "Total" FLOAT)

What is the total for the first exercise and has 18 as the second exercise?
SELECT SUM("First Exercise") FROM table_12404 WHERE "Second Exercise" = '18'
SELECT SUM("First Exercise") FROM "table_12404" WHERE "Second Exercise" = '18'