YOU SAID:

I have fifteen mongolian children in my basement

INTO JAPANESE

私は地下室に15人のモンゴル人の子供がいます

BACK INTO ENGLISH

I have 15 Mongolian children in the basement

INTO JAPANESE

私は地下室に15人のモンゴル人の子供がいます

BACK INTO ENGLISH

I have 15 Mongolian children in the basement