3. A test contains 10 questions. A correct answer is awarded 2 marks,

1.	3. A test contains 10 questions. A correct answer is awarded 2 marks, a wrong answer -1 marks and a question not answered is awarded 0 marks. A student attempts 7 questions and gets 8 marks. How many questions did the student answer correctly?
Answer» Answer: 5 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) adding (1) and (2) 3x +y-y = 7+8 3x = 15 x = 5 and y = 2 So 5 correctly attempted questions

3. A test contains 10 questions. A correct answer is awarded 2 marks, a wrong answer -1 marks and a question not answered is awarded 0 marks. A student attempts 7 questions and gets 8 marks. How many questions did the student answer correctly?

Answer»

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)

adding (1) and (2)

3x +y-y = 7+8

3x = 15

x = 5 and y = 2

So 5 correctly attempted questions