수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] 깔끔하게 남은 요금

Amath 2021.10.10 04:17 조회 327

문제 푼 사람 1명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

A는 오늘 버스를 탔다. 버스 요금은 730원을 냈고, 카드에 남은 돈은 5000원이었다. 그 카드는 얻고 나서 딱 한번만 충전을 했는데, 그때 정확히 기억은 나지 않지만 10000원이나 10만원이나 100만원이나... 어쨌든 $10^{n}$ (n은 자연수이고, 4 이상이다. )형태의 수만큼 충전을 했다. 그리고 처음에 카드에는 3000원이 들어 있었다.

문제 : 이를 이용하여 버스 요금이 서로 다른 버스가 있음을 보이시오. (버스로 간 정류장 수에 따라 요금이 달라지진 않는다. )

이전글 베스킨 31

다음글 [연재 특집] 백작 vs 삼총사 8화

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현이 Lv.5 2021.10.10 21:45 비밀댓글

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- Amath Lv.8 2021.10.11 03:40 비밀댓글
  
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