F.4 MATHS.......................................
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F.4 MATHS
2010-07-19 1:28 am
回答 (1)
2010-07-19 1:38 am
✔ 最佳答案
Let x be the minimum number of questions she has answered correctly ,then she have 20 - 2 - x = 18 - x wrong answers.Her marks =5x - 2(18 - x) - 1(2) > 605x - 36 + 2x - 2 > 607x > 98x > 14The required minimum number is 15. (15 is the minimum number > 14)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100718000051KK01027