YOU SAID:

I went to the store and bought 5 pounds of bananas

INTO JAPANESE

私は店に行き、5ポンドのバナナを買いました

BACK INTO ENGLISH

I went to the store and bought a 5 pound banana

INTO JAPANESE

私は店に行き、5ポンドのバナナを買いました

BACK INTO ENGLISH

I went to the store and bought a 5 pound banana