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.
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