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7th Class Mathematics Perimeter and Area Question Bank Perimeter and Area

  • question_answer
    The perimeter of rectangular piece of paper is 56 cm. If the length is three times its width, what is its width?

    A)  8 cm                                     

    B)  56 cm

    C)  7 cm                                       

    D)  21 cm

    Correct Answer: C

    Solution :

     Perimeter = 56 cm Given length is three times its width. Let the width be x cm. Then length \[=3x\text{ }cm\] \[\therefore\]  Perimeter \[=2(x+3x)=8x\,cm\] \[\Rightarrow\]   \[8x=56\,\,\Rightarrow \,\,x=7\] \[\therefore\]   Width \[=7\text{ }cm\]


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