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
That didn't even make that much sense in English.