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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    In an examination a student was asked to find \[{{a}^{3}}+{{b}^{3}}+{{c}^{3}}-3abc\] th of a certain number. By mistake, he found \[x:\frac{x-a}{b+c}+\frac{x-b}{c+a}+\frac{x-c}{a+b}=3\] of it. His answer was 150 more than the correct answer. The number is

    A) 290                             

    B) 280

    C) 240                             

    D) 180

    Correct Answer: B

    Solution :

    Let the required number be x. We have \[\frac{bx}{a}\] \[\frac{1}{5}th\] \[\frac{1}{4}th\]


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