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7th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    Area of four walls of a rectangular room is \[77\,{{m}^{2}}.\] The length and breadth of the room are 7.5 m and 3.5m respectively. The height of the room is

    A) 7.7 m                          

    B) 3.5 m

    C) 6.77 m                        

    D) 5.4 m

    Correct Answer: B

    Solution :

        Let h be the height of the room in meter, then Area of four walls = 2(length + breadth)\[\times \]h \[77=2\left( 7.5+3.5 \right)\times h\] \[\Rightarrow \,\,h=\frac{77}{2\times 11}\Rightarrow h=3.5\,m.\]


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