Problem
Question
noun
The problem topic is the problem or question you have to answer. If you think about it, topics as problems tends to be a school-related thing. So, when you have to answer a problem in school, that's 問題.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ワニカニの売り上げが落ちるのはトーフグにとって大きな問題です。
It would be a big problem for Tofugu if WaniKani's revenue were to drop.
この数学の問題、全然分からないんだけど。
I don't understand this math problem at all.
「週末、私の犬の世話をしてもらえないかな?」「問題ないよ。任せといて。」
"Can you look after my dog for the weekend?" "No problem. You can count on me."
試験の問題は一問だけだった。「あなたは本当にあなたですか。」
The exam contained only one question. "Are you really you?"