YOU SAID:

I'm gonna sell 15 different children

INTO JAPANESE

私は15の異なる子供を売るつもりです

BACK INTO ENGLISH

I'm going to sell 15 different kids.

INTO JAPANESE

15人の子供を売ります

BACK INTO ENGLISH

I'm going to sell you 15 kids.

INTO JAPANESE

15人の子供を売ります

BACK INTO ENGLISH

I'm going to sell you 15 kids.