Question

In a test plus 3 marks are given for every correct answer and -1 marks are given for every incorrect answer sona attempted all the questions and scored + 20 marks to she got 10 correct answers how many incorrect answer has attempted how many questions were given in the test

Answer 1

3 marks - if correct
-1 mark - if wrong


Total scored by her : 20marks (which includes both correct as well as wrong answers)

So , no of correct answer is : x
no of wrong answer is : y

Mark for correct answer : 3x
Mark for wrong answer : –1y

The equation is , (3x-y =20)

As per question she attempted 10 correctly ,

3(10) – y = 20
Y = 10
Therefore,
Wrong Answers attempted by her is 10