In an examination, a student scores 4 marks for every correct answer and losses 1 mark for every wrong answer. A student attempted all the 200 questions stud and scored 200 marks. Find the number of questions he answered correctly.
Correct Answer: Description for Correct answer:
Let the number of correct answers be x
and number of wrong answers be y
Then, 4x - y = 200 ...(i)
and x + y = 200 ...(ii)
On adding Eqs. (i) and (ii). we get
4x - y = 200
x + y = 200
5x = 400
Therefore, x = 80
Part of solved Linear Equations questions and answers :
>> Aptitude >> Linear Equations