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pythagoras123

  • 4 years ago

There are 20 questions in a quiz. 5 marks are awarded for each correct answer, 2 marks are deducted for each wrong answer and 1 mark was awarded if the question was not attempted. Sophia got 67 marks altogether. How many questions did she get correct?

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  1. Eric_Playsinacoolway
    • 4 years ago
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    assumeing that 15 correct ans...

  2. hashsam1
    • 4 years ago
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    she got 14 right 3 wrong and skipped 3

  3. hashsam1
    • 4 years ago
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    this makes total score of 67 :D

  4. Eric_Playsinacoolway
    • 4 years ago
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    good logic @hashsam1

  5. hashsam1
    • 4 years ago
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    14*5=70 right answers 3*2=6 wrong ones 70-6=64 as she had skipped 3 thus she was awarded 3 marks her total score 64+3=67 Thanks

  6. marco26
    • 4 years ago
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    Hmm, I guess this is the equation ,, :) not sure, though 5x + y -2z = 67 x + y + z = 20 Let x be the no. of correct answer, y be the skiipped answer, z be the wrong no...and solve,,:)

  7. hashsam1
    • 4 years ago
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    @marco26 can you solve that for us? :P

  8. marco26
    • 4 years ago
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    this is consistent with hashsam1 's answer

  9. marco26
    • 4 years ago
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    lol,, this can be done by gauss jordan reduction, or any convenient method,..anyway, the answer is already there :)

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