Japanese by Example
Learning through examples in manga

What score did you get with 〜の

Grammar Explanation: Reasoning with 〜のだ

美少女戦士セーラームーン » Volume 1 » Page 20

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

お母(かあ)さん:
「さっき　そこで海野(うみの)クンに会(あ)ったわよ。海野(うみの)くんテストで９５点(てん)だったって」
「で、うさぎは何店(なんてん)だったの？」
"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.