数学题:如果每间5人,则有14人没床位
- 时间:2020-06-09 15:27:22
- 分类:数学世界
- 阅读:140 次
数学题:小学安排学生宿舍,如果每间5人,则有14人没床位;如果每间7人,则多4个空床位。请问宿舍有多少间?住宿学生有多少人?请问列式计算怎么解?
数学题解答:住宿舍的间数为:(14+4)÷(7-5)=9(间);学生总人数:5×9+14=59(人)。
分析:安排7人间住满,由题意可知:所住的人数比学生总人数多出4人,若把7人间住满时的人数安排住5人间,那应多出(14+4)人,而从安排住5人间到安排住7人间,每间只多2人,多出18人需要几个房间?据此可算出房间的数量为18÷2=9(个),进而算出人数。
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