 Hello and welcome to this session. My name is Mansi and I am going to help you with the following question. The question says how many tiles with dimensions 5 cm and 12 cm will be needed to fit in a region whose length and breadth are respectively 100 cm and 144 cm. In this question we are given the dimensions of the tile that is 5 cm and 12 cm. Now we are given the region and we are given the dimensions of the region. So the length and breadth of the region are 100 cm and 144 cm respectively. So now we need to find that totally how many tiles will be required to fit in this much area. Before starting with a solution to this question let us see the key idea behind the question. The key idea behind the question is that number of tiles is equal to area of the region divided by area of one tile. Now since in this question we are given the dimensions of the region so we can find the area of the region then we are given the dimensions of the tile so we can find the area of the tile and when we divide them we get our answer that is the number of tiles. So now we can start with a solution to this question. First of all let us find area of region that will be equal to length into breadth that is 100 cm into 144 cm, 100 cm into 144 cm that will be equal to 14,400 square cm. Now we find the area of one tile will be equal to 5 cm into 12 cm that is equal to 60 square cm. Now by using the key idea we can find the number of tiles. So we see that number of tiles is equal to area of region divided by area of one tile that is equal to 14,400 square cm divided by 60 square cm. Now from the numerator and denominator we cancel 1, 0. Now here if we divide the numerator and denominator by 6 we get 240 in the numerator and 1 in the denominator square cm gets cancelled with square cm and we are left with 240. So the total number of tiles is our answer to the question that is 240. So I hope that you understood this question and enjoyed the session. Have a good day.