 Hi and welcome to the session. I am Leha and I am going to help you with the following question. The question says Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth and height of 15 meter, 10 meter and 7 meter respectively. From each can of paint, 100 meter square of area is painted. How many cans of paint will she need to paint the room? Now before proceeding for the solution, let's recall the formula of area of 4 walls and that is equal to 2 into h into l plus b, where l, b and h are the length, breadth and height of the 4 walls. This is the key idea for this question. Now let's see its solution. Here in this question, we are given the length, breadth and height as 15 meters, 10 meters and 7 meters. So here length l is equal to 15 meters, breadth b is equal to 10 meters and height h is equal to 7 meters. So let us find out area of 4 walls first and that will be equal to 2 into h into l plus b by the key idea. Let's substitute the values, we will get 2 into h that is 7 into l plus b, l is 15 plus b is 10 and the unit will be meter into meter that is meter square. So this is equal to 2 into 7 into 25 meter square that is 350 meter square. Now in question, it is given that the Daniel is painting the walls and the ceiling of a cuboidal hall. So now we need to find the area of the ceiling. So let us write area of ceiling is equal to, now ceiling will be in the form of a rectangle. So its area will be length into breadth. So let us suppose that this is a cuboidal hall whose length is 15 meters, breadth is 10 meters and height is 7 meters. This is the ceiling of the hall. So here its length will be 15 meters and breadth will be 10 meters. So that means here we will substitute the values that is l l is 15 into b that is 10 meter square. So this will be equal to 150 meters square. Now let us find out the total area painted and this will be equal to area of 4 walls plus area of the ceiling and this will be equal to area of 4 walls that is 350 meters square plus area of ceiling that is 150 meters square. So this is 500 meters square. So Daniel has painted 500 meters square of the area. Now in question we are given that from each can of paint 100 meters square of area is painted. How many cans of paint will she need to paint the room? So number of cans required to paint 100 meters square of area is equal to 1 as given in the question. So this implies number of cans required to paint 1 meter square of area is equal to 1 upon 100 and thus number of cans required to paint 500 meters square of area will be equal to 1 upon 100 into 500 cans that is equal to 5 cans. So a required answer for this question is 5 cans which are required to paint the area of the 4 walls and the ceiling. With this we finish this session. Hope you must have understood the question. Goodbye, take care and have a nice day.