Question

A test contains 10 questions. A correct answer is awarded two marks, a wrong answer is awarded -1 mark and a question not answered is awarded zero marks. A student attends seven questions and gets 8 marks. How many questions did the student answered correctly?

Answer 1

Answer:

Step-by-step explanation:

Let correct attempts be x and incorrect attempts be y

Total attempts = x+y = 7 ...(1)

Total marks = 2x-y = 8 ...(2)

(Eqn1) +(Eqn2)

3x +y-y = 7+8

3x = 15

x = 5 and y = 2

Number of Correct Answer = 5