中一數學1題

2007-11-29 3:03 am

30% of students bring their own lunchboxes. 55% buy their lunch at school. If the difference between the two group is 60 students, find the number of F.1in the school.

回答 (6)

鯉躍龍門

2007-11-29 3:07 am

✔ 最佳答案

Let the number of F.1 in the school is x.
(55%-30%)x=60
25%x=60
x=240
Therefore the number of F.1 in the school is 240.

參考: My own answer

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spy

2007-11-29 7:59 am

Let the number of F.1 in the school is x,

(55% - 30%)x = 60
25%x = 60
0.25x = 60
x = 60/0.25
x = 240

Therefore the number of F.1 student in the school is 240.

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[匿名]

2007-11-29 6:31 am

60 除(100%-55%-30%)=400人
60/(100%-55%-30%)=400 people

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2007-11-29 3:15 am

let Z be no. of student,

Z 乘 ( 55% - 30%) = 60
z = 60 / 25%
z = 240人

ok無????

希望幫到你

參考: 全公司同事心得

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[匿名]

2007-11-29 3:10 am

Let the no.of F.1 students in the school be X ,
X ( 55%-30%) = 60
25%X = 60
X = 60 除 25%
X = 240