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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    \[11x+12y=58\]and \[12x+11y=57,\] the value of \[4(x+y)\] is...

    A) 5                                 

    B) 12

    C) 20                   

    D) 24

    Correct Answer: C

    Solution :

    \[a+b+5,2a+2b-1\]              ?(1) \[a+b-5,2a+ab+1\]             ?.(2) Add (1) and (2)             \[a-b+5,2a-2b+5\]             \[a+b+c=9\] So,  \[4\times (x+y)=4\times 5=20.\]


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