# Find the area of the four walls of a room whose length is 6m , breadth 5m and height 4m . also find the cost of white -washing the walls , if the rate of white washing is Rs 5 per square meter . (Doors , windows and other openings ignored.)

solution: Here , $l=6m,$ $b=5m$  and $h=4m$

$\therefore$             Area of the walls $=2h(l+b)=\left \{ 2\times4\times(6+5) \right \}m^2=(8\times11)m^2=88m^2$

cost of  white washing of 1 $m^2$ $=Rs5$

$\therefore$           cost of the white washing of the walls  $=Rs(5\times88=)Rs 440$

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