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수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
PF＿
2022.06.30 06:20
조회 117
경환이는 그 사람과 헤어져,다른 쪽을 둘러보려고 했다.
천국호텔은 방이 무한하긴 하지만, 31415번방까지는 1층에 길게 늘어져 있다.
그리고, 조금 더 튀어나와있다.
그렇게 1층의 끝에는 뭐가 있을까가 궁금하여 가던 도중,
문을 하나 발견했다.
잠겨있었는데, 이런 쪽지가 붙어 있었다.
<문제>
농도가 10%인 소금물 1.8L와 농도가 45%인 소금물 2.5L가 있다.
이를 각각 A와 B라 하자.
그럼 A의 80%와 B의 20%를 담은 후, 큰 통에 섞었다.
그리고 A의 15%와 B의 35%를 담은 후, 다른 큰 통에 섞었다.
이 큰 통을 각각 C와 D라 하자.
그런 다음, A의 3%와 B의 27%와 C의 78%를 담은 후, 또 다른 큰 통에 섞었다.
이 또 다른 큰 통을 E라 하자,
마지막으로, A의 1%와 D의 C와 B를 각각 20% 섞은 소금물의 농도만큼 담은 후, E의 소금물 농도 만큼의 비율과 섞었다.
이걸 또 큰 통 하나에 담은 후 섞었다.
이걸 F라 하자.
F의 들어있는 물의 양(xL면 x로 변환)+소금물의 농도(n%면 n으로 변환)를 소수점 아래 3자리까지 구하라.
지금 바로
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