Question

In a class test, 3 marks are awarded for each correct answer and -1 marks are awarded for each incorrect answer. A student scored 25 marks and had answered 10 questions correctly. How many questions did he answer incorrectly?

• A. 2
• B. 3
• C. 5
• D. 7

Answer 1

The correct option is C 5

Marks awarded for each correct answer = 3
Marks awarded for each incorrect answer =(-1)
Marks obtained by the student = 25
Marks obtained by answering 10 questions correctly $=10\times 3=30$

So, total negative marks = 25 - 30 = -5

Therefore, total number of incorrect answers $=\frac{-5}{-1}=5$