What score did you get with 〜のだ

Grammar Explanation

美少女戦士セーラームーン » Kanzenban Release » Volume 1 » Page 20

After failing a test at school, Usagi drowns her sorrows at the arcade. She returns home late and find her mother expecting her.

「さっき そこで海野(うみの)クンに()ったわよ。海野(うみの)くんテストで95(てん)だったって」
“I saw Umino a while ago. He said he scored 95 points on a test.”
“So, what was your score, Usagi?”
Literal: “So, it is that your score is how many points, Usagi?”

Usagi’s mother has the observation that Usagi has received a grade on her test, but the observation is incomplete as she does not know how many points Usagi received.