CREATE TABLE table_name_51 (year INT, trim VARCHAR, power VARCHAR)

What's the Year average that's got Trim of LS/LT and Power of HP (KW)?
SELECT AVG(year) FROM table_name_51 WHERE trim = "ls/lt" AND power = "hp (kw)"
SELECT AVG("year") FROM "table_name_51" WHERE "hp (kw)" = "power" AND "ls/lt" = "trim"