YOU SAID:
I had lunch with eight friends
INTO JAPANESE
私は8人の友人と昼食をとりました
BACK INTO ENGLISH
I had lunch with eight friends
INTO JAPANESE
私は8人の友人と昼食をとりました
BACK INTO ENGLISH
I had lunch with 8 friends
INTO JAPANESE
友達8人でランチ
BACK INTO ENGLISH
Lunch with 8 friends
INTO JAPANESE
友達8人でランチ
BACK INTO ENGLISH
Lunch with 8 friends
That didn't even make that much sense in English.