"모든 문제가 어려워요."

Translation: Every problem is difficult.

[E.J.H]

"Every problem is hard" should also be accepted.

[KookieBTSARMY101]

Hard is 힘들다 :)

[IzebeRucke]

Is "All problems are hard" not correct?

[KookieBTSARMY101]

Again, hard is 힘들다 :)

[CooperReid4]

That's usually why it is a problem

[LexyCarrie]

"All problems are hard" should be okay~

[KookieBTSARMY101]

Once more, XD hard is 힘들다 :)

[chilamleung]

모든 問題가 어려워요.