Question

In an examination, there are 100 questions. Each correct answer fetches
3 marks and for each incorrect answer, 1 mark is deducted. No marks are
deducted for an unattempted question. A student attempts 90 questions and scores 158 marks in total. How many questions did he get wrong?​

Answer 1

Step-by-step explanation:

In an examination, there are 100 questions. Each correct answer fetches 3 marks and for each incorrect answer, 1 mark is deducted. No marks are

deducted for an unattempted question. A student attempts 90 questions and scores 158 marks in total. How many questions did he get wrong?    

• Let the number of questions which are right be m.
• So correct answers fetches him 3 marks = 3m
• Number of attempted questions = 90
• Therefore number of wrong answers = 90 – m
• Now marks deducted for wrong answer = - 1 (90 – m)
• So total marks obtained = 3m + (-1)(90 – m)  
•                          So 3m + (-1)(90 – m) = 158
•                               3m – 90 + m = 158
•                                   4m = 158 + 90  
•                                   4m = 248
•                                  Or m = 248 / 4
•                                  Or m = 62
• Therefore number of questions that were wrong will be 90 – 62  
•                                                                                         = 28

Reference link will be

https://brainly.in/question/27820109

Answer 2

Step-by-step explanation:

here is ur answer

hope it helped un