 Hello and welcome to the session. In this session, we discussed the following question which says, A room is 6.5 meters long, 4.5 meters broad and 2.5 meters high. It has two doors, each measuring 1.5 meters per 1 meter and two windows, each measuring 2 meters per 1 meter. Find the cost of painting its 4 walls at a piece 5 per square meter. Before we move on to the solution, let's recall the formula for the area of a rectangle. This is equal to L into B where L is the length of the rectangle, B is the breadth of the rectangle. Then we have the formula for the area of 4 walls of a room. This is equal to 2 into H into L plus B where this L is the length of the room, B is the breadth of the room, H is the height of the room. This is the key idea to be used in this question. Let's move on to the solution now. Let's consider first the length of the room say L, this is given as 6.5 meters. Then the breadth of the room say B is given as 4.5 meters. Then the height of the room say H is given as 2.5 meters. Now let's find out the area of the 4 walls of the room. This is equal to 2 into H into L plus B. We substitute the values for H, L and B. So this would be equal to 2 into 2.5 into 6.5 plus 4.5 meters square. This is the area of the 4 walls of the room. This is further equal to 5 into 6.5 plus 4.5 meters square. That is this is equal to 5 into 11 meters square which is further equal to 55 meters square is the area of the 4 walls of the room. Next let's find out the area of 1 door of the room. Now it is given that 1 door measures 1.5 meters by 1 meter. So area of 1 door would be equal to 1.5 into 1 meter square that is equal to 1.5 meter square is the area of 1 door. And we have 2 doors in the room. So area of 2 doors would be equal to 2 into area of 1 door that is 1.5 meter square. And this is equal to 3 meter square is the area of 2 doors. Next we have area of 1 window. And this is equal to as given in the question that 1 window measures 2 meters by 1 meter. So area of 1 window would be equal to 2 into 1 meter square which is equal to 2 meter square is the area of 1 window. Now since the room has 2 windows so we will find out the area of 2 windows and this is equal to 2 into area of 1 window which is 2 meter square. So this is equal to 4 meter square is the area of 2 windows. Next we have the total area of 2 doors and 2 windows. This would be equal to the area of 2 doors that is 3 meter square plus the area of 2 windows which is 4 meter square and this is equal to 7 meter square. So total area of 2 doors and 2 windows is 7 meter square. Now when we paint the rooms we would paint the walls and not the doors and the windows. So the area to be painted would be equal to the area of the 4 walls minus the total area of 2 doors and 2 windows. So this would be equal to 55 which is the area of the 4 walls minus the total area of 2 doors and 2 windows which is 7. So 55 minus 7 meter square and this is equal to 48 meter square is the area to be painted. Now I have given in the question that the cost of painting the 4 walls is rupees 5 per square meter. So now the total cost of painting the 4 walls is equal to rupees 5 into 48. So this is equal to rupees 240. So the total cost of painting the 4 walls is rupees 240 hence rupees 240 is our final answer. This completes the session. Hope you have understood the solution for this question.