F.1 Maths Questions
2012-01-29 4:06 am
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If 20 students obtained grade'E' in the exam, how many students obtained grade'C' or above?
解答贈點:20
回答 (2)
2012-01-29 4:13 am
✔ 最佳答案
Let x be the no. of the students that attended the exam.x (36°/360°) = 20
x = 200
.·.There are a total of 200 students that attended the exam.
Students obtained grade 'C' or above:
200 · (144°+72°+18°)/360° = 130
.·. There are 130 students who obtained grade 'C' or above.
2012-01-29 10:22 am
The number of students obtained grade'C' or above is :
20/36/360 X (18+72+144)/360
=200 X 234/360
=130
希望幫到你~ ^^
20/36/360 X (18+72+144)/360
=200 X 234/360
=130
希望幫到你~ ^^
收錄日期: 2021-04-13 18:29:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120128000051KK00749