有甲乙两个书架
- 时间:2020-06-19 15:24:28
- 分类:数学世界
- 阅读:125 次
有甲乙两个书架,甲书架上的存书数是乙书架的存书数的3倍,乙书架共有三层存书,上层存书数占总数的7/24,如果从下层拿5本书放到上层,则三层存书数相等。甲书架存书多少本?
数学题解答:把乙看作单位“1”,如果从下层拿5本书放到上层,则三层存书数相等,说明每层的存书数占乙书架总存书数的1÷3=1/3。
上层存书数占总数的7/24,从下层拿5本书放到上层,上中下才各占总数的1/3,而乙原来的存书数只占总数的7/24,用1/3-7/24=1/24,求出从下层拿5本书放到上层后比原来多1/24,也就是5本书的对应分率,用具体的数量除以对应的分率,5÷1/24=120本,求出单位“1”的量,也就是乙书架的存书数。
甲书架上的存书数是乙书架的存书数的3倍,用120×3=360本,求出甲书架上的存书数。(解答者:子华粉丝)
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