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Function: require_once

수학동아 - 폴리매스
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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [창의]더러운 물과 깨끗한 물
space 2020.10.26 02:00 조회 407
문제 푼 사람 0명
공유하기
페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

순도 100%의 증류수 1L가 있다

그것을 우리 가족과 함께 나눠 먹으려고 한다

하지만 어떤 사람이 먹으면 그 물이 더러워 질 수도 있다

다음과 같다

사람 먹을 수 있는 청결도(물의 순도) 자기가 먹으면 변하는 청결도
나 95% 80%
동생 30% 50%
엄마 85% 100%
아빠 50% 25%

자기가 먹으면 변하는 청결도는 (원래 청결도+자기가 먹으면 변하는 청결도)÷2가 청결도가 된다

그럼 먼저 먹는 순서대로 1,2,3,4L를 먹는다고 할 때 딱 한 명이 물을 못 먹은 경우는 몇 가지인가?

이 문제 어떠셨나요?

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