どう答えたら

how to answer

→ どう
phrase Rare #26,630
how to answer Often followed by いい or よい, as in どう答えたらいい? (“How should I answer?”), or by わからない (“I don't know how to answer”).
JA: この質問にどう答えたらいいかわかりません。
EN: I don't know how to answer this question.

私は彼の質問にどう答えたらよいかわからなかった

I didn't know how to answer his question.

どう答えたらいいか分かんないよ

I don't know how to answer.

私は彼の思いがけない質問にどう答えたらよいかわからなかった

I didn't know how to answer his unexpected question.

誰もその問いどう答えたら良いかわからなかった

No one knew how to answer that question.