Question

A classroom is 7m long, 6m broad and 4m high .find the cost of whitewashing the walls and the roof at the rate of rupees 15 per m square.

Answer 1

answer is given in attachment.....hope it will helpful

Answer 2

$\mathbb{\purple{\huge{Hello\:Walkers!!}}}$

$<b><u>Answer</u></b>$

$<b><u>Step-by-step explanation</u></b>$

$<b>Given that,</b>$

L = 7m

B = 6m

H = 4m

$<b>C.S.A of a cuboid = 2(LB+BH+HL)</b>$

$<b>C.S.A of the classroom = LB+ 2BH+ 2HL</b>$

C.S.A of the classroom = [(7×6) + 2(6×4) + 2(4×7)]

C.S.A of the classroom = [(42) + (48) + (56)]

C.S.A of the classroom = $146m^2$

Cost of whitewashing = area × rate

Cost of whitewashing = $146m^2 × Rs. 15$

Cost of whitewashing = Rs. 2,190

$<b><u><font size="5">Therefore, the cost of whitewashing is Rs. 2,190.</font></u></b>$

Thanks.....!

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