Math, asked by kruthireddy, 10 months ago

There are 180 multiple choice questions in a test . A candidate gets 4 marks for every correct answer , and for every un-attempted or wrongly answered questions one mark is deducted from the total score of correct answers If a candidate scored 450 maks in the test how many questions did he answer correctly ?​ please it's very urgent. lt's a competition between me and my classmate​

Answers

Answered by tauseef98
3

Answer:

126

Step-by-step explanation:

Let the number of correctly attempted questions be x

so, the number of unattempeted or wrong question = 180-x

total marks for correct attemptions = 4x

and total marks for unattempeted or wrong question = -1 (180-x)

= x - 180

as total marks = sum of attempted and unattempeted or wrong question = 180-x

450 = 4x + x - 180

450 = 5x -180

630 = 5x

126 = x

so, the number of correctly attempted =126

Answered by manidharr07
0

Answer:

total number of questions=180

for every correct answer =4 marks

for every wrong answer =  -1 mark

marks obtained in exam=450

correctly answered questions= x

wrongly answered questions = 180-x

Step-by-step explanation:

     obtained marks correctly answered questions=4x

      obtained marks wrongly answered questions=-1(180-x)=-180+x

                                      =4x-180+x=450

                                         5x-180=450

                                         5x=450+180                         reference

                                          5x=630                             correctly=126*4=504

                                           x=630/5                            wrongly answer =-54

                                           x=126                                  total marks gained=450

correctly answered questions=126

wrongly answered questions  =54

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