Question

find the cost of whitewashing the four walls and floor of a room having dimension 8m* 6m* 4m of the rate of 50 per square metre​

Answer 1

see ,

look at the picture attached.

As shown in figure dimensions follows that .

Now, question has inderictly asked us to find the value of lateral surface area .

$lateral \: surface \: area \: = 2(lb + bh + hl) \\ lsa = 2(6 \times 4 + 4 \times 8 + 8 \times 6) \\ lsa = 2(24 + 32 + 48) \\ lsa = 2(104) \\ lsa = 208 {m}^{2}$

now it is asking rate of 50 per sq metre .

so ,

if

$1 {m}^{2} = 50 \\ then \: \\ {208m}^{2} = x \\ use \: direct \: propotion \\we \: get \: \\ 50 \times 208 = cost \: of \: white \: washing \: 4walls \\ = 10400$

so cost of white washing = 10400

Thanks

mark branliest

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