hutatu no kotae ga ittisimasita.

It is read:

ふたつ の こたえ が いっちしました。

A few notes:

• 二つ = ふたつ
• 答え = こたえ
• 一致しました = いっちしました

The spaces are just for learners. In normal Japanese writing, it would usually be written without spaces:

二つの答えが一致しました。

二つの答え means two answers.

Breakdown:

• 二つ = two (for general things)
• の = links the number to the noun
• 答え = answer

So 二つの答え is literally two answers.

Japanese often uses counters, and 〜つ is a very common general-purpose way to count things.

So:

• 一つ = one
• 二つ = two
• 三つ = three

Here, 二つ is a natural way to say two answers.

You may also see something like 二個の答え, but that sounds less natural because 個 is more for physical objects. For abstract things like answers, 二つ is much more normal.

の connects 二つ and 答え.

So:

• 二つ = two
• 答え = answers
• 二つの答え = two answers

In English, we just put the number directly before the noun: two answers.
In Japanese, の is often used when a counted expression modifies a noun like this.

が marks the thing that is doing the verb, or more accurately here, the thing that undergoes the state/action of the verb.

In this sentence:

• 二つの答え = the two answers
• が = marks them as the grammatical subject
• 一致しました = matched / agreed / coincided

So the sentence is saying that the two answers matched.

This is natural because 一致する is basically an intransitive verb here. The answers themselves are the things that are in agreement.

一致しました is the polite past form of 一致する.

Breakdown:

• 一致 = agreement / coincidence / matching
• する = to do
• 一致する = to agree, to match, to coincide
• 一致しました = matched / agreed / coincided

This is a suru-verb:

• dictionary form: 一致する
• polite non-past: 一致します
• polite past: 一致しました

So the sentence is politely stating that the two answers matched.

Because 一致しました reports something that was confirmed or happened.

In English, we might say:

• The two answers matched.
• The two answers agreed.

Japanese often uses the past when describing a result that has been observed or established.

If you wanted to emphasize the current state, you might instead say something like:

• 二つの答えが一致しています。

That sounds more like The two answers are in agreement or The two answers match.

Yes, that is the most natural interpretation.

Since 二つの答え is the subject, the sentence normally means that the two answers were the same / were in agreement with each other.

If you wanted to say that one answer matched something else, Japanese would often make that clearer, for example with と:

• この答えが模範解答と一致しました。
  This answer matched the model answer.

So in your sentence, the default meaning is that the two answers matched each other.

Yes, but the nuance changes.

• 二つの答えが一致しました。
  This simply presents the fact that the two answers matched.

• 二つの答えは一致しました。
  This puts two answers more in topic position, as if you are talking about them in contrast to something else, or continuing a discussion about them.

So が is very natural when you are just stating the result.

Not exactly.

• 同じだ means to be the same
• 一致する means to match, to agree, or to coincide

So:

• 二つの答えは同じでした。
  The two answers were the same.

• 二つの答えが一致しました。
  The two answers matched / were in agreement.

In many situations the meanings overlap, but 一致する sounds a bit more formal and objective. It is common in contexts like:

• calculations
• test answers
• data comparison
• statements or opinions lining up

Yes, it is natural, especially in a formal or objective context.

It would fit situations like:

• checking whether two solutions are the same
• comparing results from two methods
• confirming that two people gave the same answer

It sounds a bit more formal than everyday casual speech. In casual conversation, someone might also say:

• 答えが同じだった。
• 二つの答えは同じだった。

But 二つの答えが一致しました。 is perfectly natural and clear.