수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] 나쁜 곰팡이

sicma 2019.12.29 20:02 조회 546

문제 푼 사람 1명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

오늘 빵을 먹으려다 곰팡이가 피어 먹지 않았다. 그런데 곰팡이가 얼마나 빨리 피는지 궁금하여 관찰해보기로 하였다 그 결과 1일안에 곰팡이로 다 뒤덮였고 1시간마다 1.5배씩 늘어났다. 그렇다면 처음에 곰팡이가 3마리였을때 빵에는 곰팡이가 몇 마리가 피었는지 구하시오. (소수 첫째자리에서 반올림을 한다.)

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