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【OG20-P171-160题】
The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1. What is the present number of teachers?
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分析A选项
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分析B选项
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分析C选项
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分析D选项
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分析E选项
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预约讲师一对一题目解析课程设现在的老师数为x，则学生数为30x，由题目可知30x+50=25(x+5)，所以x为15
题目讨论 （2条评论）
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emily666
求哪个，设哪个
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2020-04-02 23:26:24
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默默
数值太大，不能像上一道题那样试
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2018-05-09 10:14:24
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默默回复默默
前后两个式子，学生人数相等
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2018-05-09 10:18:53
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