Question

a door of length 2m and breadth 1m and a window of length 1m and breadth 0.5m are fitted in a wall 4.5m in length and 4m in breadth. find the cost of washing the wall at the rate of rs 20 per m2.​

Answer 1

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Answer 2

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• Area of door= $\bf{2m×1m}$

$\bf{2m}$².

________________________________

• Area of wall with door = $\bf{l×b}$

$\bf{4.5m×3.6m}$

$\bf{16.20}$².

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• Area of wall without door= $\bf{16.20-2m}$².

$\bf{14.2m}$².

____________________________

• Cost of white washing the wall

$\bf{rs.20×14.2}$

Rs. 28.4