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6th Class Mathematics Ratio and Proportion Question Bank Ratio, Proportion & Unitary Method

  • question_answer
    If  \[x:9=y:7=z:4,\]then find\[\frac{x+y+z}{z}=?\]

    A)  4                                

    B)  6            

    C)  7                                

    D)  5

    Correct Answer: D

    Solution :

    Let\[\frac{x}{9}=\frac{y}{7}=\frac{z}{4}=k.\] Then\[x=9k,\,\,y=7k,\,\,z=4k\] \[\therefore \]  \[\frac{x+y+z}{z}=\frac{9k+7k+4k}{4k}=\frac{20k}{4k}=5\]


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