In a test +3 marks are given for every correct answer and -1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answes. @ how many incorrect answers has she attempted ? b) how many questions were given in the test?
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As Sona had attempted all the questions and she got 10 correct answer but 20 marks for them.
Thus 3 marks for each correct answer : 10*3= 30 marks for correct .
But given that she got only 20 marks means 30- 10 = 20.
It means that she got 10 incorrect answers and -10 for those answers.
a) Thus Sona has attempted 10 incorrect answers.
b) Total 20 questions were given in the test.
Thank You!
Thus 3 marks for each correct answer : 10*3= 30 marks for correct .
But given that she got only 20 marks means 30- 10 = 20.
It means that she got 10 incorrect answers and -10 for those answers.
a) Thus Sona has attempted 10 incorrect answers.
b) Total 20 questions were given in the test.
Thank You!
kunalp:
Hope this helps you...
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