Write SQL query to solve given problem: What is the average body weight of Asian patients?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(T2.VALUE) / COUNT(T1.patient) FROM patients AS T1 INNER JOIN observations AS T2 ON T1.patient = T2.PATIENT WHERE T1.race = 'asian' AND T2.DESCRIPTION = 'Body Weight' AND T2.UNITS = 'kg'