Question

A rectangular hall has length 18 m and height 10 m. If the total internal surface area is

1200 m2

., find the breadth.(class 8)
​

Answer 1

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}}}Areaoffourwalls=1440m2

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}}}}}costofpaintingwallof1440m2</p><p>attherateofRs.6perm2=Rs.8640

Answer 2

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Step-by-step explanation:

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