Question

3.The length breadth and height of a room are 5m, 4m, 3m respectively. The cost of whitewashing its four walls at the rate of Rs. 7.50 per square meter is

Answer 1

Answer:

Cost of white washing the four walls is Rs. 405

Step-by-step explanation:

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Answer 2

$\huge\sf\pink{Answer}$

☞ Your Answer is 375 rupees

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$\huge\sf\blue{Given}$

✭ Length,Breadth & Height of a room are 5m, 4m ,3m

✭ Its 4 walls are painted at ₹7.50 per m²

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$\huge\sf\gray{To \:Find}$

◈ The cost of white washing?

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$\huge\sf\purple{Steps}$

TSA of a cuboid is given by,

$\underline{\boxed{\sf 2(lb+bh+lh)}}$

◕ Length = 5 m

◕ Breadth = 4 m

◕ Height = 3 m

Substituting the given values,

➝ $\sf 2(5\times 4+ 4\times 3+3\times 5)$

➝ $\sf 2(20+12+15)$

➝ $\sf 2(47)$

➝ $\sf \green{TSA = 94 m^2}$

Area to be white washed is given by,

$\underline{\boxed{\sf TSA-2lb}}$

➳ $\sf 94 - 2(5 \times 4)$

➳ $\sf 94 - 2(20)$

➳ $\sf 94 - 40$

➳ $\sf \red{Area \ white \ washed = 50 cm^2}$

Cost per m² is given as ₹7.50 so then for 50 cm²

»» $\sf 50 \times 7.50$

»» $\sf \orange{Cost = Rs \ 375}$

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