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10th Class Mathematics Related to Competitive Exam Question Bank Algebra

  • question_answer
    Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is

    A)  10                                         

    B)  15

    C)  20                           

    D)         25

    Correct Answer: C

    Solution :

     Let the number of sums solved correctly be\[n\]. Then number of wrong sums\[=30-n\] \[\therefore \]  \[3n-2.(30-n)=40\] or            \[n=20\]


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