Question

The floor of a rectangular hall has length 80 m and width 40 m . Its height is 6 m . Find the cost of painting the four walls of the room at the rate of 6 rs per square metre​

Answer 1

Step-by-step explanation:

length of hall=80m

width of hall=40m

height of hall =6m

area of 4 wall room =2(l+b)×h

2(80+40)×6

2×120×6

=1440

cost of painting=1440×6

=8640

Answer 2

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Given:-

Length of the rectangular hall = 80m

Width of the rectangular hall = 40m

Height of the rectangular hall = 6m

To find:-

Cost of painting the four walls at the rate of ₹6 per m²

Solution:-

Area of four walls = 2 (l + b) h

Area of four walls = 2 (80 + 40) 6

Area of four walls = 2 (120) 6

Area of four walls = 12 × 120

$\bf{\large{\boxed{Area\: of\:four \:walls\: =\: 1440m^2}}}$

Cost of painting 1440m² at the rate of ₹6 per m²

Cost of painting = 6 × 1440

Cost of painting = ₹ 8,640

$\bf{\large{\underline{\boxed{\mathcal{cost\:of\:painting \:wall \:of\:1440\:m^2</p><p>\:at\:the\: rate\:of\:Rs.\:6\:per\:m^2\: = \: Rs. 8640}}}}}$