N3
ということだ
I heard that, Rumor has it that, It is said that, It means that
地域によってルールが違うということだ。
I hear the rules differ from area to area.
Explanation
「ということだ」 has 2 uses
1I hear that
Passes on news you heard or read, more formal than 「そうだ」, often with 「によると」.
地域によってルールが違うということだ。
I hear the rules differ from area to area.
地域によってルールが違うとのことだ。
It is said that the rules differ depending on the area.
2That means
Sums up what came before as a conclusion: 「返事がないということは、賛成ですね」 (no reply means you agree).
人によって考え方が違うという事だ。
That means different people think in different ways.
この魚は全く臭くない。まだ新鮮だということだ。
This fish doesn't smell at all. It means that it's fresh.
Mixed up with
「~そうだ」 is the most common hearsay but is rarely used in formal written summaries.
「~ということだ」 can both report and explain, and sounds weightier.
「~とのことだ」 is the politest hearsay, used in letters and business, often passing on someone's own words: 「~とのことです」.
In reading questions, 「つまり~ということだ」 marks the author's conclusion.