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रु. 200 प्रतिवर्गफिटका दरले जम्मा खर्च रु. 56000 लाग्छ । The length and height of a room are 20 ft . and 8 ft . respectively. The room contains a door of \( 7 \mathrm{ft} . \times 3 \mathrm{ft} \). and two windows each measuring \( 6 \mathrm{ft} . \times 4 \mathrm{ft} \). The cost of carpeting its floor at Rs. 200 per square feet is Rs. 56000. (a) चार भित्ताको क्षेत्रफल पत्ता लगाउने सूत्र लेखनुहोस् । Write the formula to find the area of four walls. [1K] [Ans: \( A=2 h(\ell+b) \) ] (b) उक्त कोठाको चौडाइ कति रहेछ, पत्ता लगाउनुहोस् । What is the breadth of the room? Find it. [1U] [Ans: \( b=14 \mathrm{ft} \) ]

Ask by Chang Hodgson. in Nepal
Jan 17,2025

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**कोठाको चौडाइ 14 फिट रहेको छ।**

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कोठाको चार भित्ताको क्षेत्रफल गणना गर्नको लागि \( A=2 h(\ell+b) \) सूत्र प्रयोग गरिन्छ, जहाँ \( A \) चार भित्ताको क्षेत्रफल, \( h \) कोठाको उचाइ, \( \ell \) लम्बाइ, र \( b \) चौडाइ हो। यस हिसाबले, यदि तपाईंसँग कोठाको लम्बाइ र उचाइ थाहा छ भने, चौडाइ पत्ता लगाउन सकिन्छ। यदि तपाईंको लागत रु. 200 प्रति वर्ग फिटको दर छ भने, यो दरले कति क्षेत्रफलको कार्पेटिङ गर्न सकिनेछ भनेर विचार गर्नुहोस्। उदाहरणको लागि, यदि खर्च रु. 56000 छ भने, तपाईंले यो खर्चलाई दरमा भाग दिई क्षेत्रफल पत्ता लगाउँदा \( 56000 \div 200 = 280 \, \text{sq ft} \) को कार्पेट क्षेत्रफल पाउनेछ। यसकारण, तपाईँ यस क्षेत्रफललाई भित्ताको क्षेत्रफलमा थप्न सक्नुहुन्छ र चौडाइ परिणाम निकाल्न सक्नुहुन्छ।

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