How Many Questions were Wrongly?

A students gets 4 marks for each correct answer and loses 2 marks for each incorrect answer in an examination. He attempts 40 questions and scores 100 marks. How many questions were wrongly?

  1. 18
  2.  10
  3.  15
  4.  30
Desire Adnan Default Asked on 6th September 2015 in Maths.
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1 Answer(s)

Answer: (2) 10
Explanation:-
10 question is wrong,
Then, the right question = 40 – 10
= 30
The marks obtained by 30 correct answer = 30 x 4 = 120
The marks obtained by 10 incorrect answers = 10 x 2 = 20

Then, the total marks obtained by a student = 120 – 20 = 100

Hence, the answer is (2) 10.

Anurag Mishra Professor Answered on 8th September 2015.
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