Question

The length ,breath and height of a room 5m ,4m, and 3m .The cost of white washing its four well at rate of rs2 per m sq is​

Answer 1

Answer:

lsa of cuboid is 2h(l+b)

2x3x9

54sq. m

cost- 54x2

108

Answer 2

$\sf{\bold{\green{\underline{\underline{Given}}}}}$

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• Length of the room = 5m
• Breadth of the room = 4m
• Height of the room = 3m
• Cost of white washing = Rs. 2 per m²

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$\sf{\bold{\green{\underline{\underline{To\:Find}}}}}$

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• Total cost of white washing 4 walls

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$\sf{\bold{\green{\underline{\underline{Solution}}}}}$

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$\sf{\red{\boxed{\bold{area \: of\: 4\: walls = 2h( l + b ) }}}}$

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Area of 4 walls = 2 × 3 ( 5 + 4 )

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Area of 4 walls = 2 × 3 × 9

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Area of 4 walls = 6 × 9

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Area of 4 walls = 54m²

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Cost of white washing 1 m² = Rs. 2

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Cost of white washing 54 m² = 54 × 2

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Cost of white washing 54m² = Rs. 108

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$\sf{\bold{\green{\underline{\underline{Answer}}}}}$

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• Cost of. white washing 4 walls is Rs. 108