問題, もんだい
1. question (e.g. on a test), problem
2. problem (e.g. societal, political), issue, subject (e.g. of research), case, matter
3. question (i.e. doubt)
4. public discussion, controversy
5. trouble, inconvenience, difficulty
あなたはどのようにしてその問題を解いたのですか。
だ
copula, See である, See です, plain copula
1. be, is
Auxiliary verb, See た・1, た after certain verb forms; indicates past or completed action
2. did, (have) done
See た・2, indicates light imperative
3. please, do