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Ex 13.1 Q 3

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Ex 13.1 Q 3

    • Posted by Harshit Kohli 4 years, 1 month ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Bhumika Sharma ✓ 4 years, 1 month ago

    Let length, breadth, and height of the rectangular hall be l, b, and h respectively. Area of four walls = 2lh+2bh = 2(l+b)h Perimeter of the floor of hall = 2(l+b) = 250 m Area of four walls = 2(l+b) h = 250h m2 Cost of painting per square meter area = Rs.10 Cost of painting 250h square meter area = Rs (250h×10) = Rs.2500h However, it is given that the cost of paining the walls is Rs. 15000. 15000 = 2500h Or h = 6 Therefore, the height of the hall is 6 m. ..........nice to help u ☺️

    1Thank You

    Ayush Thakur 4 years, 1 month ago

    Given: Perimeter of rectangular wall = 250 m ……….(i) Now Area of the four walls of the room = 1500 m2 ……….(ii) Area of the four walls = Lateral surface area  = 1500 [using eq. (i) and (ii) = 6 m Hence required height of the hall is 6 m.

    0Thank You

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