You would never acually say this sentence. Thats why i got it wrong, because and english person who is relatively good at their language cant translate a foreign sentence into englisb that doesnt make sense
Why doesn't Duolingo teach multiples of 10 as: 십, 이십, 삼십, etc. A native Korean speaker is telling me it is the more common way to count. Duolingo should teach this more logical method rather than having new learners memorize.