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7th Class Mathematics Simple Equations Question Bank Linear Equation in one Variable

  • question_answer
    The average of 8,10,12,14 and A is 12. The value of A is

    A)  14                               

    B)  15           

    C)  16             

    D)  17

    Correct Answer: C

    Solution :

    (c)\[\frac{(8+10+12+14+A)}{5}=12\Rightarrow 44+A=60\] \[\Rightarrow A=16\] Cross check with A = 16. Numbers are 8, 10, 12, 14, 16 Since numbers are equally spaces, middle number = 12 is average.              


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