YOU SAID:
i have 21 plates of pineapples
INTO JAPANESE
私はパイナップルの21プレートを持っています
BACK INTO ENGLISH
I have 21 plates of pineapple
INTO JAPANESE
私はパイナップルの21皿を持っています
BACK INTO ENGLISH
I have 21 dishes of pineapple
INTO JAPANESE
私はパイナップルの21皿を持っています
BACK INTO ENGLISH
I have 21 dishes of pineapple
You've done this before, haven't you.