46个人吃了100个馒头成人和小孩各有多少人
- 时间:2020-05-31 15:41:53
- 分类:数学世界
- 阅读:87 次
六年级数学群“伊萝小沫”同学请教一道“46个人吃了100个馒头”的鸡兔同笼问题:46个人吃了100个馒头。成人每人吃四个,小孩每两人吃一个。成人和小孩各有多少人?
数学题解答:这是一道属于鸡兔同笼类型的数学问题,“小孩子每两人吃一个”可以想成“每人吃半个”,即1/2个。这样就好解答了,这里使用了假设法:
假设全是成年人,一共要吃:46×4=184(个)
实际只吃了100个,少吃了:184-100=84(个)
把成年人换成小孩子,每换一次要少吃:4-1/2=3又1/2(个)
要换多少次:84÷3又1/2=24(次),这就是小孩子的人数。
成年人有:46-24=22(位)
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