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Function: driver
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Function: get_footer
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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [소수(素數)(2, 3, 5, 7같은 소수)]세븐일레븐에서 세븐일레븐만큼 물건 사기
수학만
2020.10.07 20:52
조회 455
미국에 있었던 어떤 일이다(실제로 있던 일은 아니에요!)
한 손님이 세븐일레븐(7-11)에서 네 가지 물품을 구입한다.
"7.11달러입니다." 점원이 말한다.
"그것 참 재미있네요."손님이 말한다.
"그렇죠? 저는 네 물품의 가격을 모두 더하기만 했어요." 점원이 말했다.
"더하기가 아니라 곱하기를 해야 하는 거 아닌가요?"
"상관없어요. 곱해도 정확히 같은 액수가 나오니까요."
물품의 가격은 각각 몇 달러일까?
지금 바로
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