Question

A student gets 3 marks for answering a question correctly and loses 1 mark for answering it wrong. Suppose if he answers 5 questions correctly and 2 questions wrong, then marks scored by him is:

• A. -3x + y
• B. 14
• C. 15
• D. 16

Answer 1

The correct option is A

-3x + y

Marks obtained for each correct answer = 3
Marks to be deducted for each wrong answer = 1
Number of questions answered correctly = 5
Number of questions answered wrong = 2
$\Rightarrow$ Marks obtained for the correct answers = 5 $\times$ 3
$\Rightarrow$ Marks deducted for the wrong answers =2 $\times$ 1
Marks scored = (marks for correct answers - marks for wrong answers)
= (5 $\times$ 3) - (2 $\times$ 1)
= 15 - 2
= 13
Therefore, the marks scored by the student is 13.