Re: [計量] The scores reported for a certain mu …
※ 引述《lonnan (far away)》之銘言：
: 這一題計量題不會算
: 請大家幫我看看要怎麼算
: 謝謝!
: The scores reported for a certain multiple-choice test were derived by
: subtracting 1/3 of the number of wrong answers from the number of right
: answers. On a 40-question test, if none of the questions was omitted and
: the score reported was 20, how many wrong answers were there?
: (A) 5
: (B) 10
: (C) 15
: (D) 25
: (E) 30
: Ans: C
分數是(對的題數)-(錯的題數)* 1/3
所以設x為錯的題數 可列方程式 (40-x)-1/3*x = 20
解開x就好了!!!
應該是這樣算的吧!!!
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