Kotoba no Hibiki

That’s a good question. 

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A: Why don’t the numbers balance out here?
B: That’s a good question. I’ll get back to you on that.

In this situation, what should you say ‘that’s a good question’ in Japanese?

Business

B：本当ほんとうですね。確認かくにんします。

Note: This is not a word-for-word translation.

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A word-for-word translation

B：いい質問しつもんですね。後のちほどお答こたえします。

It’s grammatically correct, but we never say that when we’re asked that question.
In English, ‘that’s a good question’ in this situation is not a compliment either. So to say, You’re just saying it to buy time.

In Japanese, we say 本当ほんとうですね, 確たしかに, 何なんででしょうね.
All of them have a sense of agreement with the other person’s question.

後のちほどお答こたえします is good and natural, but we usually say 確認かくにんします in a business situation.