Question 15.
In an examination, there were 75 questions. 3 marks were awarded for each correct answer, 1 mark was deducted for each wrong answer and 1 mark was awarded for each unattempted question. Rayan scored a total of 97 marks in the examination. If the number of unattempted questions was higher than the number of attempted questions, then the maximum number of correct answers that Rayan could have given in the examination is
Question Explanation
Let the number of questions attempted be x+y out of which x are correct and y are incorrect and the number of questions unattempted be z.
It is given,
x + y + z = 75 ...... (1)
3x - y + z = 97 ...... (2)
(2)-(1) -> x - y = 11
(1)+(2) -> 2x + z = 86
z > x + y
z > 75 - z
z > 37.5
Minimum possible value of z is 38
2x + 38 = 86
2x = 48
x = 24
The maximum number of correct answers is 24.
