The area of the swimming pool is the length times the width:
15 x 7 = 105 square meters
If each tile covers one square meter, you are going to need 105 tiles
(because 105/1 = 105)
If each tile costs 6 dollars and you need 105 tiles you can multiply these numbers to get the total cost of installing tiles on the floor of the pool
105 x 6 = $630
