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7th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions

  • question_answer
    If \[x+y=5,\,\,y+z=7\]and \[z+x=12,\] what is the value of \[x+y+z\]?

    A)  12                                           

    B)  2  

    C)  5                            

    D)         24

    Correct Answer: A

    Solution :

     \[\begin{matrix}    x+y=5  \\    y+z=7  \\    +\,z+x=12  \\    \_\_\_\_\_\_\_\_\_\_\_\_\_  \\    2(x+y+z)=24  \\ \end{matrix}\]\[\Rightarrow \]  \[x+y+z=12\]


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