수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] 편지

뉴＿턴 2020.01.02 07:50 조회 804

문제 푼 사람 0명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

민수와 민수의 동생은 편지봉투와 편지지를 각각 똑같은 양만큼을 샀다. 민수는 한번 쓸때마다 3장의 편지지를, 동생은 5장의 편지지를 쓴다. 일정한 시감이 지난뒤, 민수는 편지 봉투는 다 썻지만 편지지는 30장이 남았고, 동생은 편지지를 다 사용하고 6개의 편지봉투가 남았다. 민수는 편지지를 몇장 샀을까??

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