 Hello and welcome to the session. My name is Mansi and I am going to help you with the following question. The question says the length, breadth and height of a room are 5 meter, 4 meter and 3 meter respectively, pying the cost of white washing the walls of the room and the ceiling at the rate of Rs. 7.50 per meter square. So let us start with the solution to this question. First of all let us write down what is given to us in the question. We are given length that is l equal to 5 meter that is b equal to 4 meter that is h equal to 3 meter. Price of length is spread into height is the area of the 4 walls and length into breadth would be the area of the ceiling would be sum of these 2. Now we simply put in the values of length, breadth and height from this we get 9 and 9 meter square. So area of 4 walls including the ceiling would be 74 meter square. Now it is given to us in the question to washing Rs. 7.50 therefore area is equal to. So this becomes our answer to the question and enjoy the session. Have a good day.