题库搜索>问题求解PS-17450
A certain experimental mathematics program was tried out in 2 classes in each of 32 elementary schools and involved 37 teachers. Each of the classes had 1 teacher and each of the teachers taught at least 1 , but not more than 3, of the classes. If the number of teachers who taught 3 classes is n, then the least and greatest possible values of n, respectively, are
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
1089577z
当有14个老师教3个班时 这14个老师教了14x3=42个班 剩余(37x2)-42=22个班 最多只再需要22个老师 22+14位36名老师 但总共有37名老师 所以n取不到14
鸡麦七百加
教1门课为a个老师,2门课的b个老师,3门课的c个老师 a+2b+3c=32*2 a+b+c=37 因此b+2c=27 c最小为0,最大为13
Gika
一共64个班级 37名老师 n最小——老师尽可能只教1或2个班 当所有老师都教2个班时 可以教74个班级 74>64 已经不再需要有人教三个班 n最大——老师尽可能教3个班 使得没有教2个班的老师存在 设有x名老师教3个班 3x+(37-x)=64 x=13
科目:
问题求解PS
来源:
精选题库
2m57s
平均耗时
77.2%
平均正确率
该题由网友7ZVPal提供
点击上传问题求解PS -17850
A certain brand of house paint must be purchased either in quarts at $12 each or in gallons at $18 each. A painter needs a 3-gallon mixture of the paint consisting of 3 parts blue and 2 parts white. What is the least amoumt of money needed to purchase sufficient quantities of the two colors to make ...
问题求解PS -17819
If 2x+ 5y=8 and 3x=2y, what is the value of 2x+y ?
问题求解PS -17817
If st =2, then the value of which of the following can be determined ?Ⅰ.2ts Ⅱ.s−tt Ⅲ.t−1s−1
问题求解PS -17813
The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred, how many years old will Fred be y years from now,in terms of y ?
问题求解PS -17811
If k≠0 and ,then x=
问题求解PS -17850
A certain brand of house paint must be purchased either in quarts at $12 each or in gallons at $18 each. A painter needs a 3-gallon mixture of the paint consisting of 3 parts blue and 2 parts white. What is the least amoumt of money needed to purchase sufficient quantities of the two colors to make ...
问题求解PS -17819
If 2x+ 5y=8 and 3x=2y, what is the value of 2x+y ?
问题求解PS -17817
If st =2, then the value of which of the following can be determined ?Ⅰ.2ts Ⅱ.s−tt Ⅲ.t−1s−1
问题求解PS -17813
The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred, how many years old will Fred be y years from now,in terms of y ?
问题求解PS -17811
If k≠0 and ,then x=