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Function: driver

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Function: initiateCache

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Function: _error_handler

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: model

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: getFloatingMyInfo

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
Line: 559
Function: get_footer

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once

수학동아 - 폴리매스
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[창의 퍼즐] ㅇㄷ아파트의 목욕시간
mathwizard 2020.02.25 20:44 조회 821
문제 푼 사람 0명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

ㅇㄷ아파트는 한 층에 2가구씩 20층으로, 총40가구이다. 이40가구들 중 17가구가 오늘 씻으려고 한다. 그 중 5가구는 각각 2명씩 씻기로 했다. 두 명이서 목욕할 때는 물3L터가 필요하고, 한 명이서 목욕할 때는 물2L가 필요하다.  2분동안300ml가 나오고, 1분동안 100ml가 샌다. 한 명씩 씻는 집들부터 동시에 물을 받고, 그 집들에서 물을 다 받은 후부터 두 명씩 씻는 집들이 물을 동시에 받는다고 할 때 총 몇mL의 물을 받고 몇 분이 걸릴까?

 

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