Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per sq m.

Answer 1

Here,the dimesions of room are
Length:5m
Bredth:4m
Height:3m

Answer 2

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$\huge{\underline{\underline{\sf{\blue{SOLUTION:-}}}}}$

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$\sf{\underline{\pink{Answer-}}}$

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• The cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per sq m is Rs. 555.

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$\sf{\underline{\pink{Given-}}}$

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• The length, breadth and height of a room are 5 m, 4 m and 3 m respectively.

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$\sf{\underline{\pink{Find-}}}$

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• We have to find the cost of white washing the walls of the room and the ceiling.

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$\sf{\underline{\pink{Explanation-}}}$

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⠀⠀$\bigstar\sf \: Lenght \: (l)=5m$

⠀⠀$\bigstar\sf \: Breadth \: (b)=4m$

⠀⠀$\bigstar\sf \: Height \: (h)=4m$

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$\sf{\underline\green{Formula\:Used\:Here-}}$

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⠀$\bigstar\:\:\boxed{\sf{\red{lb+2 \: (l+b) \: h}}}$

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$\sf{\underline{\pink{Putting\:the\:values:-}}}$

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$\sf\longrightarrow(5 \times 4)+ \: 2 \: (5 + 4) \times 3$

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$\sf\longrightarrow20+ \: 2 \ \times 9\times 3$

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$\sf\longrightarrow20+ \: 18\times 3$

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$\sf\longrightarrow20+ \:54$

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$\sf\longrightarrow74 \: {m}^{2}$

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$\sf{\underline{\blue{Now-}}}$

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$\sf\longrightarrow \: Cost \: of \: white \: washing \: {1m}^{2} \: is \:7.50$

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$\sf\longrightarrow\: Cost \: of \: white \: washing \: {74m}^{2} \: is \: Rs. \: (74 \times 7.50)</p><p>$

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$\sf\longrightarrow \: Rs. \: 555$

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• Hence, the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per sq m is Rs. 555.

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