"How many girlfriends does he have?"
"ji" supposes an answer composed of only 1character, so "10" is the max for an answer of that question
English does not differentiate between “幾個“ and “多少”, so both answers are grammatically correct and should both be accepted.
Yes... Friend A: I got a boyfriend! He gave me flowers! ^u^ Me: How many girlfriends does he have? Friend A: TT^TT