F.2 MATHS
2014-04-03 4:36 am
In a general knowledge competition, 4 marksare given for each correct answer and 3 marks are deducted for each wronganswer. Sandra has got 25 marks currently and she has to answer 5 morequestions. If her current marks remain unchanged, she will be the champion. Atleast how many questions should the answer correctly to be the champion?
回答 (1)
2014-04-03 4:52 am
✔ 最佳答案
Let x be the number of correct answer25+4x-3(5-x) ≧ 25
4x-15+3x ≧ 0
7x ≧ 15
x ≧ 2.14
She at least should answer three questions correctly
收錄日期: 2021-04-20 15:04:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140402000051KK00153