The cost of carpeting a room 18 m long with carpet 75 cm wide at ₹ 4.50 per…

2023

The cost of carpeting a room 18 m long with carpet 75 cm wide at ₹ 4.50 per metre is ₹ 810. The breadth of the room is

  1. A.

    7 m / 7 मीटर

  2. B.

    7.5 m / 7.5 मीटर

  3. C.

    8 m / 8 मीटर

  4. D.

    More than one of the above

  5. E.

    None of the above

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Correct answer: B

Step 1: Total cost of carpeting = ₹810. Cost per metre = ₹4.50. So, total length of carpet used = ₹810 ÷ ₹4.50 = 180 m.

Step 2: Width of carpet = 75 cm = 0.75 m. Area covered by carpet = length × width = 180 m × 0.75 m = 135 m².

Step 3: Length of room = 18 m. Area of room = length × breadth. So, breadth = area ÷ length = 135 m² ÷ 18 m = 7.5 m.

हिन्दी उत्तर:

चरण 1: कारपेट बिछाने की कुल लागत = ₹810। प्रति मीटर लागत = ₹4.50। इसलिए कारपेट की कुल लंबाई = ₹810 ÷ ₹4.50 = 180 मीटर।

चरण 2: कारपेट की चौड़ाई = 75 सेमी = 0.75 मीटर। कारपेट द्वारा कवर क्षेत्रफल = लंबाई × चौड़ाई = 180 मीटर × 0.75 मीटर = 135 मीटर²।

चरण 3: कमरे की लंबाई = 18 मीटर। कमरे का क्षेत्रफल = लंबाई × चौड़ाई। इसलिए चौड़ाई = क्षेत्रफल ÷ लंबाई = 135 मीटर² ÷ 18 मीटर = 7.5 मीटर।

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