The school cafeteria bought a batch of Chinese cabbage, and used (2/5) of it to make pickles, which was exactly 320 kilograms. How many kilograms of Chinese cabbage did the school buy?
学校食堂买来一批大白菜，用其中的(2/5)制诈咸菜，刚好是320千克，学校买来多少千克大白菜？
<result>900</result>