The scores reported for a certain multiple-choice test were derived by subtracti

游客2025-02-24 21

问题 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?

选项 A、5
B、10
C、15
D、25
E、30

答案 C

解析某一多项选择考试的分数的计算是用答对的题数减去答错题数的1/3。在一个由40道题组成的测验中，若无题遗漏，且考试分数为20，问答错的题数有多少个?
解：本题的正确答案为(C)。设答错题数为x个，则由题意可得：(40-x)-1/3 x =20 → x=15

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The scores reported for a certain multiple-choice test were derived by subtracti

Afterweeksofuncertaintyaboutthecoursethecountrywouldpursuetostabiliz

Inacertainruralarea,peoplenormallydisposeofhouseholdgarbagebyburning

Acertainjarcontains100jellybeans:50white,30green,10yellow,5red,4

The10householdsonacertainstreethavehouseholdincomesthatrangefrom$34

Alinenshophasacertaintablecloththatisavailablein8sizesand10colors

Thealtitudeofacertaintriangularsailis2metersgreaterinlengththanits

Acertainmoneymarketaccountthathadabalanceof$48,000duringalloflast

Acertainrectanglehasperimeter54.Iftheratioofthelengthoftherectangl

Whenacertainnumberisdividedby7,theremainderis0.Iftheremainderisn

When2/5ofacertainnumberisaddedtothenumberandthissumissubtractedf

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